Hydraena prokini Jäch & Díaz 2006

Trizzino, Marco, Carnevali, Lucilla, Felici, Stefano De & Audisio, Paolo, 2013, <strong> A revision of <em> Hydraena </ em> species of the “ <em> Haenydra </ em> ” lineage (Coleoptera, Hydraenidae) </ strong>, Zootaxa 3607 (1), pp. 1-173 : 40-62

26. Hydraena prokini Jäch & Díaz 2006

Hydraena (s. str.) prokini Jäch & Díaz 2006: 62 .

Male genitalia: Fig. 20e ; female elytral apex: Fig. 20l ; geographic range: Fig. 21 .

Type locality: Russia, Krasnodar region, Khosta district, a few km SW of Novorossiysk, small stream (Shirokaya Balka) at tourist camp "Ocean", N 44°39', E 37°41', 150 m a.s.l. (“ Small stream ( Shirokaya Balka ), tourist camp “ Ocean ”, 44°39'N / 37°41'S, a few km southwest of Novorossiysk , southwe- stern Krasnodarskiy Kray , southern Russia ”: Jäch & Díaz 2006) .

Primary types: Holotype at NMW.

Measurements: Length: 2.05 mm. EL/EW = 1.57; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus indistinguishable from H. planata ( Fig. 20a ).

Taxonomic position and diagnostic characters: Distinct from its sibling H. krasnodarensis , H. solodovnikovi and H. planata by the differently shaped female elytral apex ( Fig. 20l ) and by the differently shaped apical half of the aedeagal main piece ( Fig. 20e ).

Habitat: This species was collected under stones in a small fastflowing stream ( Jäch & Díaz 2006).

Chorotype: CAUC (Caucasian Endemic).

Distribution: EUR: RU ( Fig. 21 ).

H. prokini is so far known solely from the type locality ( SW Krasnodar) .

DNA data: No data.

27. Hydraena vedrasi d’Orchymont 1931

Hydraena (Haenydra) vedrasi d’Orchymont 1931: 29 ;

Hydraena (Haenydra) montenegrina Pretner 1970: 19 ; Berthélemy & Whytton Da Terra 1977: 39.

Male habitus: Fig. 22a ; male genitalia: Fig. 22d ; female elytral apex: Fig. 22g ; geographic range: Fig. 23 .

Type locality: Greece, Eubea Island (“Eubée”: d’Orchymont 1931) .

Primary types: Holotype at ISNB.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.65; PW/PL = 1.40; PW/EW = 0.78.

Diagnosis: Body dark brown to black. Palps pale reddish brown, legs dark brown. Labrum with a V-shaped notch on anterior margin. Clypeus shiny, frons densely and regularly punctate.

Pronotum sub-hexagonal, notably wide, with external angle rounded. Pronotal disc notably convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra slightly convex, distinctly elongate, wide and parallel - sided. Elytral apex subtruncate in male, with a prominent sutural notch in female ( Figs. 22a,g ). Elytral margin very slightly explanate and long, not reaching apex. Male pro-, meso- and metatibiae not dilated; male metatibiae with a fringe of very long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Males of H. vedrasi are distinct from males of the related H. jaechiana by the wide and subtruncate elytra (resembling H. truncata ), the differently shaped aedeagal main piece, characterized (in lateral view) by a triangular-shaped apex, and the aedeagal flagellum, notably shorter than in H. jaechiana ( Figs. 22a, d ). The female elytral sutural notch is notably more prominent in H. vedrasi than in H. jaechiana ( Fig. 22g ). Molecular data confirmed a sister-group relationship between H. vedrasi and H. jaechiana , with both species included in the H. gracilis macro-clade ( Trizzino et al. 2011b).

Habitat: This species mostly lives in relatively wide and deep fastflowing streams, often with granitic substrates, between 50 and 1500 m a.s.l. HER: Heterotopic species.

Chorotype: BALK (Balkanian Endemic).

Distribution: EUR: AL, GR, MC, YU ( Fig. 23 ).

H. vedrasi is widely distributed in Balkans, from Serbia to Greece, including N Peloponnesus (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b).

28. Hydraena jaechiana ( Audisio & De Biase 1990)

Haenydra jaechiana Audisio & De Biase 1990: 382 .

Male habitus: Fig. 22b ; male genitalia: Fig. 22e ; female elytral apex: Fig. 22h ; geographic range: Fig. 23 .

Type locality: Greece, Peloponnesus, Tripoli province, Dara, 800 m a.s.l. (“Grecia, Peloponneso, Dara [ Tripoli ], m 800”: Audisio & De Biase, 1990) .

Primary types: Holotype at MZUR.

Measurements: Length: 2.3 – 2.5 mm. EL/EW = 1.75; PW/PL = 1.50; PW/EW = 0.90.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with a V-shaped notch on anterior margin. Clypeus shiny and finely punctured, frons sparsely punctate.

Pronotum sub-hexagonal, pronotal disc moderately convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae.

Elytra convex, elongate and parallel - sided, apically convergent in male, with a slight sutural notch in female ( Figs. 22b,h ). Elytral margin moderately explanate and long, not reaching apex.

Male pro-, meso- and metatibiae not dilated; male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: See differential diagnosis of H. vedrasi .

Habitat: This species usually lives in fastflowing streams with carbonatic substrates, between 100 and 1800 m a.s.l. HER: eu37.

Chorotype: PELO (Peloponnesian Endemic).

Distribution: EUR: GR-Peloponnesus ( Fig. 23 ).

H. jaechiana is endemic to Peloponnesus (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b).

29. Hydraena epeirosi Ferro 1985

Hydraena (Haenydra) epeirosi Ferro 1985: 91 .

Male habitus: Fig. 22c ; male genitalia: Fig. 22f ; female elytral apex: Fig. 22l ; geographic range: Fig. 23 .

Type locality: Greece, Ioannina province, Mètsovon, 900 m a.s.l. (“ Epiro, Mètsovon [ Ioànnina ]”: Ferro 1985) .

Primary types: Holotype at CFT.

Measurements: Length: 2.5 – 2.7 mm. EL/EW = 1.70; PW/PL = 1.35; PW/EW = 0.76.

Diagnosis: Body red to reddish brown. Palps and legs pale reddish brown. Labrum with a deep V-shaped notch on anterior margin. Clypeus shiny sparsely punctured, frons shiny, not densely punctate. Pronotum sub-hexagonal, wider than longer. Pronotal disc convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate and parallel - sided, explanate margin of elytra narrow and not reaching apex. Elytral apex obtusely truncate in male, markedly sinuate (resembling H. lazica and H. bononiensis ) in female ( Figs. 22c,l ). Male metatibiae with a moderately prominent dilatation in the inner edge of distal third, and with a fringe of relatively long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: This seemingly isolated species is distinct from other " Haenydra " by means of body colouration (suggesting a somewhat similarity with H. decolor and allies), the peculiar elytral shape (particularly female) and male genitalia, crowning with a notably thin, minutely spiralized flagellum, longer than the whole body ( Fig. 22f ), suggesting closer relationships with H. lazica and allies. Finally, molecular analyses placed H. epeirosi in a basal position within the H. gracilis macro-clade, therefore excluding close relationships both with H. decolor and with H. lazica ( Trizzino et al. 2011b) .

Habitat: This species lives in cold fastflowing streams with relatively abundant vegetal debris and carbonatic substrates, between 900 and 1400 m a.s.l., especially in canyons. HER: eu23; eu37.

Chorotype: GRNW (NW Greek Endemic).

Distribution: EUR: GR, GR-Peloponnesus ( Fig. 23 ).

H. epeirosi , so far known only from a few localities in NW Greece, was recently collected also in N Peloponnesus (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b).

30. Hydraena gracilis Germar 1824

Hydraena gracilis Germar 1824: 94 ;

Hydraena elongata Curtis 1830: 307 ; Pretner 1931b: 84;

Hydraena concolor Waterhouse 1833: 293 ; Balfour-Browne 1958: 190–192;

Hydraena monticola Rey 1884: 30 ; Pretner 1931b: 84;

Hydraena cribrata Rey 1886: 103 ; Jäch 1995a: 179;

Hydraena obscuripes Gerhardt 1900: 69 ; Pretner 1931b: 83;

Hydraena (Haenydra) gracilis ssp. balcanica d’Orchymont 1930a: 369 .

Male habitus: Fig. 24a ; male genitalia: Fig. 24c ; female elytral apex: Fig. 24m ; geographic range: Fig. 25 .

Type locality: As stated by Jäch (1995), the type material was very probably collected by Phillip-Wilbrand- Jacob Müller (1772–1851) near Odenbach an der Gian, Pfalz [= Palatinate], Rheinland-Pfalz, southwest Germany (“Habitat in territorio Rheni bavarico”: Germar 1824) .

Primary types: As suggested by Jäch (1995), the type series of H. gracilis was probably destroyed.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.85; PW/PL = 1.38; PW/EW = 0.95.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with a V-shaped notch on anterior margin. Clypeus shiny, frons densely and regularly punctate. Pronotum sub-hexagonal, relatively wide. Pronotal disc convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra convex, distinctly elongate, parallel - sided. Elytral apex conjointly rounded in male, with a more or less prominent sutural notch in female ( Figs. 24a,m ). Elytral margin slightly explanate. Male pro-, meso- and metatibiae not dilated; male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Easily recognizable among all " Haenydra " by the markedly elongate and narrow (" gracilis ") elytra ( Fig. 24a,m ). Distinct from its closest allies (members of H. gracilis complex; table 1) by the outline (in lateral view) of the aedeagal main piece, especially in the apical half ( Fig. 24c ). Easily distinguishable from H. crepidoptera and H. graciloides also by means of female elytral shape ( Fig. 24m ).

Habitat: This species lives in different habitat typologies, even if the largest numbers of specimens are usually collected in fastflowing streams with carbonatic substrates. HER: Heterotopic species.

Chorotype: EUR (European).

Distribution: EUR: AU, BE, BH, BY, BU, CR, CZ, DE, EN, FI, FR-FRA, GB, GE, GR, HU, IR, IT-ITA, LA, LT, LU, MC, NL, NR, PL, RO, RU, SK, SL, SV, SZ, TR, YU, UK ( Fig. 25 ).

H. gracilis has an almost whole European distribution (including Great Britain and Ireland, northwards to N Finland), eastwards to Ukraine (see Appendix 2 for all the detailed known localities). Iberian specimens so far attributed to H. gracilis were recently attributed ( Trizzino et al., 2012a) to a new, distinct species ( H. gracilidelphis ).

DNA data: For this species, mtDNA (COI, 16S rDNA, tRNA leu and NAD1) and nuclear DNA (18S rDNA, 28S rDNA) data are available in GenBank ( Trizzino et al. 2011b; Ribera et al. 2011).

31. Hydraena gracilidelphis Trizzino, Valladares, Garrido & Audisio 2012

Hydraena gracilis auct. (partim): d’Orchymont 1934b: 10; d’Orchymont 1936: 40; Berthélemy & Whitton Da Terra 1977: 36; Valladares & Montes 1991: 28; Valladares, Díaz & Garrido 2000: 71.

Hydraena gracilidelphis Trizzino, Valladares, Garrido & Audisio 2012a: 1067 .

Male genitalia: Fig. 24d ; female elytral apex: Fig. 24n ; geographic range: Fig. 25 .

Type locality: Spain, León province , Valverdín (“E [España]: Valverdín, León”: Trizzino et al. 2012a) .

Primary types: Holotype at NMW.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.85; PW/PL = 1.38; PW/EW = 0.95.

Diagnosis: Male habitus indistinguishable from that of H. gracilis ( Fig. 24a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. gracilis .

Habitat: This species lives in different habitat typologies, even if the largest numbers of specimens are usually collected in fastflowing streams with carbonatic substrates. HER: eu16, eu31, eu49.

Chorotype: NIBE (N Iberian Endemic).

Distribution: EUR: PT, SP ( Fig. 25 ).

H. gracilidelphis is endemic to the N portion of Iberian Peninsula (including Portugal).

DNA data: For this species, mtDNA (COI, 16S rDNA, tRNA leu and NAD1) data are available in GenBank ( Ribera et al. 2011).

32. Hydraena graciloides (Jäch 1988)

Haenydra graciloides Jäch 1988b: 766 .

Male genitalia: Fig. 24e ; female elytral apex: Fig. 24o ; geographic range: Fig. 25 .

Type locality: Turkey, Bolu province, Yedigöller National Park (“ Yedigöller bei Bolu ”: Jäch 1988b) .

Primary types: Holotype at NMW.

Measurements: Length: 2.3 – 2.5 mm. EL/EW = 1.67; PW/PL = 1.38; PW/EW = 0.78.

Diagnosis: Male habitus closely resembling H. gracilis ( Fig. 24a ).

Taxonomic position and diagnostic characters: Distinct from H. gracilis and allies by the more elongate and explanate male elytra, and the differently shaped female elytral apex, characterized by a markedly prominent Vshaped sutural notch ( Fig. 24o ).

Furthermore, H. graciloides is distinguishable from other species of the H. gracilis complex ( Table 1; Jäch 1995a) by the outline (in lateral view) of the aedeagal main piece, which is longer than in any other species of the complex, and is characterized by an obliquely, and not horizontally, truncate apex ( Fig. 24e ).

Easily distinguishable from H. crepidoptera also by the peculiar elytral shape of that species.

Habitat: This species was collected in small streams in mixed forest, above 950 m a.s.l.

Chorotype: ANAN (N-Anatolian Endemic).

Distribution: AS: TR ( Fig. 25 ).

H. graciloides is apparently endemic to the Yedigöller National Park area (NW Turkey), where it was collected exclusively in two different sites (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b).

33. Hydraena elisabethae Jäch 1992

Hydraena (Haenydra) elisabethae Jäch 1992: 81 .

Male genitalia: Fig. 24f ; female elytral apex: Fig. 24p ; geographic range: Fig. 25 .

Type locality: Greece, Thassos Island , Potamia (“ Little spring (ca. 40 m long), above the village of Potamia, eastern Thassos, northern Greece ”: Jäch 1992) .

Primary types: Holotype at NMW.

Measurements: Length: 2.3 – 2.5 mm. EL/EW = 1.85; PW/PL = 1.38; PW/EW = 0.95.

Diagnosis: Male habitus closely related to H. gracilis ( Fig. 24a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. gracilis .

Habitat: This species was collected in two notably small and cold streams. HER: eu23.

Chorotype: THRA (Thracian Endemic).

Distribution: EUR: GR-Thassos ( Fig. 25 ).

H. elisabethae is endemic to Thassos Island (NE Greece), where it was collected in two different sites (see Appendix 2 for all the detailed known localities).

DNA data: No data.

34. Hydraena anatolica Janssens 1963

Hydraena (Haenydra) anatolica Janssens 1963: 143 .

Male genitalia: Fig. 24g ; female elytral apex: Fig. 24q ; geographic range: Fig. 25 .

Type locality: Turkey, Bolu, Lake Abant , 1440 m a.s.l. (“ Bolu, lac d’Abant [Anatolie, NW d’Ankara]”: Janssens 1963) .

Primary types: Holotype at ISNB.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.85; PW/PL = 1.38; PW/EW = 0.95.

Diagnosis: Male habitus identical to H. gracilis ( Fig. 24a ).

Taxonomic position and diagnostic characters See differential diagnosis of H. gracilis .

Habitat: This species was collected in small fastflowing streams between 800 and 1600 m a.s.l.

Chorotype: ANAT (Anatolian Endemic).

Distribution: EUR: TR; AS: TR ( Fig. 25 ).

H. anatolica is relatively widespread from N to SE Anatolia (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Ribera et al. 2011; Trizzino et al. 2011b).

35. Hydraena nike Jäch 1995

Hydraena (Haenydra) nike Jäch 1995a: 188 .

Male genitalia: Fig. 24h ; female elytral apex: Fig. 24r ; geographic range: Fig. 25 .

Type locality: Greece, Thrakia , Samothraki Island , Fonias River , ca. 3 km SE Therma (“ Fonias [=murderer] River , ca. 3km SE Therma, Samothraki Island, Thrakia, northern Greece ”: Jäch 1995a) .

Primary types: Holotype at NMW.

Measurements: Length: 2.1 – 2.2 mm. EL/EW = 1.85; PW/PL = 1.38; PW/EW = 0.95.

Diagnosis: Male habitus identical to H. gracilis ( Fig. 24a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. gracilis .

Habitat: This species was collected in a notably small fastflowing stream. HER: eu23.

Chorotype: THRA (Thracian Endemic).

Distribution: EUR: GR-Samothraki ( Fig. 25 ).

H. nike is presently known from a single stream in Samothraki island. Otherwise, Jäch (1995) reported that ca. 20 specimens from NE Turkey agree with the types of H. nike sp.n. in the shape of the apical half of aedeagal main piece, even if with considerable larger sizes (0.48–0.52 µm). Deeper studies are required, but, as Jäch (1995) underlined, these Turkish specimens probably could not belong to H. nike because of the huge geographic distance between Samothraki and NE Turkey (see Appendix 2 for all the detailed known localities). Moreover, in a recent trip in N Turkey (including NE) by the authors, specimens belonging to the related H. anatolica were exclusively collected, whereas no specimens of H. cfr. nike were found.

DNA data: No data.

36. Hydraena crepidoptera Jäch 1992

Hydraena (Haenydra) crepidoptera Jäch 1992: 80 .

Male habitus: Fig. 24b ; male genitalia: Fig. 24l ; female elytral apex: Fig. 24s ; geographic range: Fig. 25 .

Type locality: Turkey, Sinop province, Dranaz Pass (“ Stream [2–3 m wide] on Diranaz Pass , north of Boyabat , 1000 m, Sinop Province, Turkey ”: Jäch 1992) .

Primary types: Holotype at NMW.

Measurements: Length: 2.3 – 2.5 mm. EL/EW = 1.95; PW/PL = 1.60; PW/EW = 1.10.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with a V-shaped notch on anterior margin. Clypeus shiny, frons densely punctate. Pronotum sub-hexagonal, notably wide and convex. Pronotal disc strongly convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, completely parallel - sided, with elytral margin distinctly widely explanate. Elytral apex conjointly rounded in male, with a notably prominent V-shaped sutural notch in female ( Figs. 24b,s ). Male pro-, meso- and metatibiae not dilated; male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Easily diagnosed from other species of the H. gracilis complex ( Table 1; Jäch 1995a) by the wide and convex pronotum, the widely explanate elytral margin, the prominent sutural notch in female elytral apex, and the differently shaped aedeagal main piece ( Figs. 24b,l,s ). Finally, females of H. crepidoptera can be distinguished from females of H. sinope and H. septemlacuum by its more prominent elytral sutural notch ( Fig. 24s ).

Habitat: This species was collected in notably small fastflowing streams above 1000 m a.s.l.

Chorotype: ANAN (N Anatolian Endemic).

Distribution: AS: TR ( Fig. 25 ).

H. crepidoptera is known from a few localities in N Turkey (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b).

37. Hydraena larissae Jäch & Díaz 2000

Hydraena (Haenydra) monticola auct.: Ganglbauer 1901: 328 (partim), nec Rey 1885: 30; Pretner 1931a: 79;

Haenydra saga auct.: Audisio & De Biase 1995: 164 (partim), nec d’Orchymont 1930b: 225;

Haenydra emarginata auct.: Audisio & De Biase 1995: 164 (partim), nec Rey 1885: 30;

Hydraena (s. str.) larissae Jäch & Díaz 2000: 156 .

Male habitus: Fig. 26a ; male genitalia: Fig. 26d,e ; female elytral apex: Fig. 26o,p ; geographic range: Fig. 27 .

Type locality: Italy, Trentino Alto Adige, Bolzano province , SW of Bolzano , Mendel Pass (“ Passo di Mendola [Mendel Pass], southwest of Bolzano [Bolzen], Trentino Alto-Adige, northern Italy ”: Jäch & Díaz 2000) .

Primary types: Holotype at NMW.

Measurements: Length: 1.95 – 2.2 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with very deep V-shaped notch on anterior margin. Fronto - clypeal suture slightly arcuate, strongly impressed, frons densely and rugosely punctate in lateral regions. Pronotum slightly cordiform, wider than long, with anterior margin concave and lateral margin denticulate. Pronotal disc convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, parallel - sided, rather strongly declivitous laterally. Explanate margin of elytra relatively wide; elytral apex conjointly rounded in male, with a more or less prominent V-shaped sutural notch in female ( Figs. 26a,o,p ). Male pro-, meso- and metatibiae not dilated; male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from other members of the H. emarginata complex ( Table 1; Trizzino et al. 2011a) by the differently shaped aedeagal main piece, characterized by an obliquely truncate apex, and a dorsal margin of apical half gently emarginate ( Fig. 26d,e ).

Furthermore, the distal lobe of the aedeagus of H. larissae is extremely variable in size, with some specimens characterized by a large distal lobe ( Fig. 26e ), resembling H. emarginata , whereas others characterized by a smaller distal lobe ( Fig. 26d ), resembling H. saga . Specimens showing the morphotype with distal lobe "large" were found solely in the W portion of the species geographic range (NW Italy, Piedmont), although in some cases (e.g. Mt. Viso and Oropa; NMW) were collected together with specimens showing a "small" aedeagal distal lobe.

The absence of a complete geographic separation among populations showing the two morphotypes, and the resulting intra-populational variability, do not allow to regard now the two aedeagal morphotypes as belonging to two different species. Anyway, preliminary molecular analyses ( Trizzino et al. 2011b) suggested that H. larissae , in its present definition, is probably paraphyletic: in fact, populations of this species from NE Italy were found to be more related to H. tarvisina (NE Italy, Veneto) than to populations from W Alps (Piedmont) of the same species. Further molecular and morphological analyses are therefore needed.

Habitat: This species usually lives in small fastflowing streams, mainly in Fagus forest, between 1000 and 2200 m a.s.l. HER: eu3; eu11.

Chorotype: ALPS (S - Alpine Endemic).

Distribution: EUR: IT - ITA ( Fig. 27 ).

H. larissae is endemic to Italian Alps, from Piemonte to Trentino Alto Adige (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

38. Hydraena emarginata Rey 1885

Hydraena (Haenydra) gracilis var. emarginata Rey 1885: 30 ;

Hydraena (Haenydra) emarginata ; Pretner 1931b: 84, nec auct.: Audisio & De Biase 1995: 164 (partim).

Male genitalia: Fig. 26c ; female elytral apex: Fig. 26n ; geographic range: Fig. 27 .

Type locality: Pyrenees (“Pyrenees”: Rey 1885).

Primary types: Holotype / Lectotype not yet formally designated. Type series in MHNL .

Measurements: Length: 2. 0 – 2.3 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae . Moreover, the distal lobe of the aedeagus of H. emarginata is markedly larger than in any other related species ( Fig. 26c ), except for some specimens from NW Italy (Audisio & De Biase 1995), so far tentatively attributed to H. larissae .

Habitat: This species usually lives in cold and fastflowing streams, above 800 m a.s.l. HER: Heterotopic species.

Chorotype: PYRE (Pyrenean Endemic).

Distribution: EUR: FR-FRA, SP ( Fig. 27 ).

H. emarginata has a geographic distribution ranging from NW Spain to French Pyrenees (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

39. Hydraena diazi Trizzino, Jäch & Ribera 2011

Hydraena (Haenydra) saga auct. (partim): Valladares & Montes 1991: 32; Valladares, Díaz & Garrido 2000: 71.

Hydraena diazi Trizzino, Jäch & Ribera 2011 , in Trizzino, Jäch, Audisio & Ribera 2011a: 30 .

Male genitalia: Fig. 26f ; female elytral apex: Fig. 26r ; geographic range: Fig. 27 .

Type locality: Spain, Barcelona province , Montseny, La Costa, Sot de Ritronyes, 620 m, N41º45’23.5” E2º24’49.8” ( Trizzino et al. 2011a) .

Primary types: Holotype at MNCN.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae .

Habitat: This species usually lives in cold and fastflowing streams, from 300 to 1200 m a.s.l. HER: eu5; eu6.

Chorotype: PYRE (Pyrenean Endemic).

Distribution: EUR: FR-FRA, SP ( Fig. 27 ).

H. diazi is endemic to Spanish and French Pyrenees (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

40. Hydraena fosterorum Trizzino, Jäch & Ribera 2011

Hydraena (Haenydra) saga auct. (partim): Valladares & Montes 1991: 32; Valladares, Díaz & Garrido 2000: 71.

Hydraena fosterorum Trizzino, Jäch & Ribera 2011 , in Trizzino, Jäch, Audisio & Ribera 2011a: 32 .

Male genitalia: Fig. 26g ; female elytral apex: Fig. 26s ; geographic range: Fig. 27 .

Type locality: Spain, Burgos province , Fresneda de la Sierra, river Tirón, 1085 m a.s.l., N 42º16’46.2” W 3º7’56.0” ( Trizzino et al. 2011a) .

Primary types: Holotype at MNCN.

Measurements: Length: 2.15 – 2.30 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae .

Habitat: This species usually lives under stones in cold and fastflowing streams above 1000 m a.s.l. HER: eu46.

Chorotype: NIBS (N Iberian System Endemic).

Distribution: EUR: SP ( Fig. 27 ).

H. fosterorum is endemic to the N Iberian System, N Spain (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

41. Hydraena hispanica Ganglbauer 1901

Hydraena (Haenydra) hispanica Ganglbauer 1901: 328 .

Male habitus: Fig. 26b ; male genitalia: Fig. 26h ; female elytral apex: Fig. 26t ; geographic range: Fig. 27 .

Type locality: Spain, Extremadura, Cáceres, La Granja (“ La Granja im Centralen Spanien”: Ganglbauer 1901) .

Primary types: Holotype / Lectotype not yet formally designated. Type series lost.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.94; PW/PL = 1.25; PW/EW = 0.79.

Diagnosis: Body reddish brown to dark brown. Palps and legs pale reddish brown. Labrum with V-shaped notch on anterior margin. Fronto - clypeal suture slightly arcuate, strongly impressed, frons densely and rugosely punctate in middle and lateral regions. Pronotum sub-hexagonal, with anterior margin concave and lateral margin denticulate. Pronotal disc convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, narrower than in related species, slightly convex, parallel - sided in the proximal half, apically convergent. Margin of elytra slightly explanate; elytral apex obtusely subtruncate in both sexes, ( Figs. 26b,t ). Male mesotibiae slightly arcuate, and with the row of small teeth in the inner edge of distal third (typical of all " Haenydra " species) notably more prominent than in related species ( Fig. 26b ). Male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from other members of the H. emarginata complex ( Table 1; Trizzino et al. 2011a) by the narrower pronotum, the convex, subtruncate and narrower elytra, the peculiar mesotibiae, and the differently shaped aedeagal main piece, characterized (in lateral view) by a relatively thin and sub-triangular apex ( Figs. 26b,h ).

Habitat: This species usually lives under stones in cold and fastflowing streams between 20 and 700 m a.s.l. HER: Heterotopic species.

Chorotype: IBER (Iberian Endemic).

Distribution: EUR: PT, SP ( Fig. 27 ).

H. hispanica is endemic to NW-Central N Spain and Portugal (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Ribera et al. 2011; Trizzino et al. 2011a, b).

42. Hydraena saga d’Orchymont 1930

Hydraena (Haenydra) saga d’Orchymont 1930b: 225 , nec Haenydra saga auct.: Audisio & De Biase 1995: 164 (partim).

Male genitalia: Fig. 26l ; female elytral apex: Fig. 26u ; geographic range: Fig. 27 .

Type locality: Germany, Rheinland-Pfaltz , Eifel, Tombach (“Eifel: Ahrgernirge, Tombach”: d’Orchymont 1930b) .

Primary types: Holotype at ISNB.

Measurements: Length: 2.2 – 2.3 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae .

Habitat: This species usually lives under stones in cold and fastflowing streams, between 600 and 1500 m a.s.l. HER: Heterotopic species.

Chorotype: CEU (Central - European).

Distribution: EUR: AU, BH, CZ, FR, GE, HU, MC, PL, RO, SK, UK, YU ( Fig. 27 ).

H. saga has a widespread Central European distribution, ranging from E France to Ukraine (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

43. Hydraena alpicola Pretner 1931

Hydraena (Haenydra) saga ssp. alpicola Pretner 1931b: 99 ;

Hydraena alpicola ; Jäch 2004: 103.

Male genitalia: Fig. 26m ; female elytral apex: Fig. 26v ; geographic range: Fig. 27 .

Type locality: Austria, neighbourhoods of Wien, Rekawinkel (“ Austria, Wienerwald, Rekawinkel ”: Pretner 1931b) .

Primary types: Holotype / Lectotype not yet formally designated. Type series in PMSL .

Measurements: Length: 2. 0 – 2.2 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae .

Habitat: This species usually lives under stones in cold and fastflowing streams, mostly above 800 m a.s.l. HER: eu1; eu2; eu45.

Chorotype: ALPE (E Alpine Endemic).

Distribution: EUR: AU, BH, CR, IT-ITA, SL, SZ ( Fig. 27 ).

H. alpicola has a Central European distribution, ranging from Switzerland to Bosnia. In Italy H. alpicola is known from a single locality near the Italy / Slovenia border (Audisio et al. 1995; See Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

44. Hydraena dalmatina Ganglbauer 1901

Hydraena (Haenydra) dalmatina Ganglbauer 1901: 327 .

Male habitus: Fig. 28a ; male genitalia: Fig. 28b ; female elytral apex: Fig. 28e ; geographic range: Fig. 29 .

Type locality: Bosnia-Herzegovina, Brčko district, Begovina (“Begovina”: Ganglbauer 1901, Jäch 1990).

Primary types: Lectotype ( NMW) designated by Jäch (1990).

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.56; PW/PL = 1.45; PW/EW = 0.69.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with V-shaped notch on anterior margin. Clypeus shiny, fronto - clypeal suture slightly arcuate, strongly impressed, frons densely and rugosely punctate in middle and lateral regions. Pronotum sub-hexagonal, wider than long, with anterior margin concave and lateral margin slightly posteriorly sinuate. Pronotal disc convex, sparsely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, slightly convex, parallel - sided in the proximal half, slightly divergent in distal third in both sexes. Explanate margin of elytra notably wide, elytral apex relatively acuminate in male, slightly truncate in female ( Figs. 28a,e ). Male pro-, meso- and metatibiae not dilated. Male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from related species belonging to the H. emarginata and H. excisa complexes ( Table 1; Trizzino et al. 2011a) by the widely explanate and posteriorly divergent elytra ( Figs. 28a,e ), and by the differently shaped aedeagal main piece ( Fig. 28b ).

Habitat: This species usually lives under stones in cold and fastflowing streams with siliceous substrates above 900 m a.s.l. HER: eu45.

Chorotype: BALK (Balkanian Endemic).

Distribution: EUR: CR, BH, MC, YU ( Fig. 29 ).

H. dalmatina is endemic to N Balkans, from Croatia to Montenegro (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI) are available in GenBank ( Ribera et al. 2011; Trizzino et al. 2011a, b).

45. Hydraena belgica d’Orchymont 1930

Hydraena (Haenydra) belgica d’Orchymont 1930a: 373 ;

Hydraena (Haenydra) subintegra auct.: Pretner 1931b: 92, nec Ganglbauer 1901: 326.

Male genitalia: Fig. 28c ; female elytral apex: Fig. 28f ; geographic range: Fig. 29 .

Type locality: Belgio, Namur Province , Pondrôme, Snaye stream (“ Belgique, Pondrôme …dans la Snaye ”: d’Orchymont 1930a) .

Primary types: Holotype at ISNB.

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.68; PW/PL = 1.36; PW/EW = 0.79.

Diagnosis: Male habitus identical to H. akbesiana ( Fig. 32a ; see below).

Taxonomic position and diagnostic characters: See differential diagnosis of H. akbesiana .

Habitat: This species usually lives under stones in cold and fastflowing streams, between 50 and 1000 m a.s.l. HER: Heterotopic species.

Chorotype: CEU (Central - European).

Distribution: EUR: AU, BE, BH, CR, CZ, FR-FRA, IT-ITA, NR, GE, HU, PL, RO, SL, SK, SZ ( Fig. 29 ).

H. belgica has a Central European distribution, ranging from E France to Rumania (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b; Ribera et al. 2011).

46. Hydraena tarvisina ( Ferro 1991)

Haenydra tarvisina Ferro 1991: 217 .

Male genitalia: Fig. 28d ; female elytral apex: Fig. 28g ; geographic range: Fig. 29 .

Type locality: Italy, Veneto, Treviso province, Collalto , 264 m a.s.l. (“Collalto [ TV]”: Ferro 1991) .

Primary types: Holotype at CFT.

Measurements: Length: 1.7 – 2.2 mm. EL/EW = 1.52; PW/PL = 1.45; PW/EW = 0.76.

Diagnosis: Male habitus almost identical to H. larissae ( Fig. 26a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. larissae .

Habitat: This species usually lives in little streams and springs with particularly small amounts of water. In summer, these springs are often reduced to a humid soil with a few drops of water, and this species frequently survives even in the most superficial layers of hyporheic waters. HER: eu11.

Chorotype: PADA (Padanian Endemic).

Distribution: EUR: IT - ITA ( Fig. 29 ).

H. tarvisina is endemic to the surroundings of Treviso (NE Italy) (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

47. Hydraena samnitica Fiori 1904

Hydraena (Haenydra) gracilis var. samnitica Fiori 1904: 252 ;

Hydraena (Haenydra) samnitica ; d’Orchymont 1930b: 223;

Hydraena (Haenydra) gracilis ssp. samnitica ; Pretner 1931b: 81.

Male habitus: Fig. 30a ; male genitalia: Fig. 30c ; female elytral apex: Fig. 30f ; geographic range: Fig. 31 .

Type locality: Italy, Abruzzo, Gran Sasso Massif, Teramo province, Pietracamela (“in un torrente d’acqua freddissima che dal Gran Sasso scende a Pietracamela”: Fiori 1904) .

Primary types: Holotype / Lectotype not yet formally designated. Type series in ZMHB .

Measurements: Length: 2.3 – 2.7 mm. EL/EW = 1.76; PW/PL = 1.42; PW/EW = 0.77.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with V-shaped notch on anterior margin. Clypeus shiny, fronto - clypeal suture posteriorly arcuate, strongly impressed, frons rugosely punctate. Pronotum sub-hexagonal, wider than long, with anterior margin concave. Pronotal disc convex, sparsely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, slightly convex, parallel - sided. Explanate margin of elytra relatively wide and long, almost reaching apex. Elytral apex conjointly rounded in male, widely explanate and with a strongly prominent V-shaped sutural notch in female ( Figs. 30a,f ). Male pro-, meso- and metatibiae not dilated, male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from related species belonging to the H. emarginata complex ( Table 1; Trizzino et al. 2011a) by notably larger size, the peculiar shape of female elytral apex, and the differently shaped aedeagus, characterized (in lateral view) by a notably thin and long main piece, and an obliquely truncate apex ( Figs. 30a,c,f ). H. samnitica can be distinguished from its sibling H. pangaei solely by means of the shape of aedeagal main piece ( Figs. 30a,d ).

Habitat: This species usually lives under stones in small springs and streams in Fagus forests, above 900 m a.s.l., mainly on carbonatic substrates. HER: eu20.

Chorotype: APPC (Central Apenninic Endemic).

Distribution: EUR: IT - ITA ( Fig. 31 ).

H. samnitica is endemic to Abruzzo and SE Latium, Central Italy (see Appendix 2 for all the detailed known localities) .

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011a, b; Ribera et al. 2011).

48. Hydraena pangaei Jäch 1992

Hydraena (Haenydra) pangaei Jäch 1992: 82 .

Male genitalia: Fig. 30d ; female elytral apex: Fig. 30g ; geographic range: Fig. 31 .

Type locality: Greece, Kavala province , Pangaeon Mount , above Domatia (“ Little spring on Pangaeon Mountain, north of Domatia, northern Greece ”: Jäch 1992) .

Primary types: Holotype at NMW.

Measurements: Length: 2.5 – 2.7 mm. EL/EW = 1.76; PW/PL = 1.42; PW/EW = 0.77.

Diagnosis: Male (and female) habitus identical to H. samnitica ( Fig. 30a ).

Taxonomic position and diagnostic characters: See differential diagnosis of H. samnitica .

Habitat: This species was collected in very little springs, in Fagus forests, with particularly small amounts of water at nearly 1500/ 1600 m a.s.l. In summer, these springs are often reduced to humid soil with a few drops of water. HER: eu89.

Chorotype: THRA (Thracian Endemic).

Distribution: EUR: GR.

H. pangaei is endemic to Mt. Pangaeon, in N Greece (see Appendix 2 for all the detailed known localities). DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank

( Trizzino et al. 2011a, b; Ribera et al. 2011).

49. Hydraena pelops Jäch 1995

Hydraena (Haenydra) pelops Jäch 1995b: 40 .

Male habitus: Fig. 30b ; male genitalia: Fig. 30e ; female elytral apex: Fig. 30h ; geographic range: Fig. 31 .

Type locality: Greece, Peloponnesus, Messinia province, Taygetos Massif, Vassiliko forest , ca. 20 km NE Kardamili, 1200 m a.s.l. (“ Stream in the Vassiliko forest region, ca. 1.5–2 m wide, ca. 1200 m a.s.l., ca. 20 km E Kardamili, Taigetos Mts. , Messinia , Peloponnese, southern Greece ”: Jäch 1995b) .

Primary types: Holotype at NMW.

Measurements: Length: 2.3 – 2.5 mm. EL/EW = 1.56; PW/PL = 1.50; PW/EW = 0.82.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with V-shaped notch on anterior margin. Clypeus shiny, fronto - clypeal suture posteriorly arcuate, strongly impressed; frons densely punctate. Pronotum hexagonal, wider than long, with anterior margin markedly concave. Pronotal disc convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra elongate, slightly convex, parallel - sided. Explanate margin of elytra notably wide, elytral apex slightly truncate in male, markedly truncate in female ( Figs. 30b,h ). Male pro-, meso- and metatibiae not dilated. Male metatibiae with a fringe of relatively long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from related species belonging to the H. emarginata and H. excisa complexes ( Table 1; Trizzino et al. 2011a) by the truncate elytral apex in both sexes, particularly in female ( Figs. 30b,h ), and the differently shaped aedeagus, characterized by larger size and by a distal lobe with a morphology intermediate between species of the H. emarginata and H. excisa complexes ( Fig. 30e ).

Habitat: This species was collected under stones in small streams between 1200 and 1800 m a.s.l., in Fagus forests. HER: eu37. Chorotype: PELO (Peloponnesias Endemic). Distribution: EUR: GR-Peloponnesus. H. pelops is endemic to S Peloponnesus, where it is known solely from the surroundings of Messinia and Sparti, on the slopes of the Mount Taygethos (see Appendix 2 for all the detailed known localities). DNA data: No data.

50. Hydraena akbesiana Audisio, De Biase & Jäch 1993

Hydraena (Haenydra) akbesiana Audisio, De Biase & Jäch 1993: 490 .

Male habitus: Fig. 32a ; male genitalia: Fig. 32c ; female elytral apex: Fig. 32m ; geographic range: Fig. 33 .

Type locality: Turkey, Adana province, Nur Mts., 5 km West of Yarpuz, 1000 m a.s.l. (“ Turkey, Adana Province, Nur Dag [ Amanus Mountains ], small stream crossing the Osmaniye-Yarpuz road, about 5 km west of Yarpuz , 1000 m ”: Audisio et al. 1993) .

Primary types: Holotype at MZUR.

Measurements: Length: 2.1 – 2.3 mm. EL/EW = 1.68; PW/PL = 1.36; PW/EW = 0.79.

Diagnosis: Body dark brown to black. Palps and legs pale reddish brown. Labrum with V-shaped notch on anterior margin. Clypeus shagrened and finely punctured, frons sparsely punctate. Pronotum hexagonal, wider than long, with anterior margin slightly concave. Pronotal disc moderately convex, densely punctate near anterior and posterior margin, along midline and at posterior foveae. Elytra notably convex, elongate, parallel - sided in the apical half. Explanate margin of elytra moderately wide and long, reaching apex. Elytral apex slightly truncate in male, rounded, and with a moderately prominent sutural notch, in female ( Figs. 32a,m ). Male pro-, meso- and metatibiae not dilated. Male metatibiae with a fringe of long setae along mesal face of distal half.

Taxonomic position and diagnostic characters: Distinct from related species belonging to the H. excisa complex ( Table 1) exclusively by the differently shaped aedeagus, characterized (in lateral view) by a moderately prominent hump on the dorsal margin of apical half of main piece ( Fig. 32c ).

Habitat: This species was collected under stones in small fastflowing streams above 1200 m a.s.l.

Chorotype: ANAS (S Anatolian = Taurian Endemic).

Distribution: AS: TR ( Fig. 33 ).

H. akbesiana is endemic to S and SE Turkey (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b; Ribera et al. 2011).

51. Hydraena excisa Kiesenwetter 1849

Hydraena gracilis var. b. excisa Kiesenwetter 1849: 186 ;

Hydraena gracilis var. b. erosa Kiesenwetter 1849: 186;

Hydraena (Haenydra) excisa ; Pretner 1931b: 95.

Male genitalia: Fig. 32b ; female elytral apex: Fig. 32l ; geographic range: Fig. 33 .

Type locality: Not specified in original description; probably from Germany ( Kiesenwetter 1849) .

Primary types: Holotype / Lectotype not yet formally designated. Kiesenwetter’s collection originally in Deutsches Entomologisches Institut, Eberswalde, Germany, now at ZMHB .

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.68; PW/PL = 1.36; PW/EW = 0.79.

Diagnosis: Male habitus identical to H. akbesiana ( Fig. 32a ) and allies.

Taxonomic position and diagnostic characters: See differential diagnosis of H. akbesiana .

Habitat: This species usually lives under stones in cold fastflowing streams above 300 m a.s.l. In N Europe ( Finland) this species was collected also at sea level. HER: Heterotopic species .

Chorotype: CEU (Central - European).

Distribution: EUR: AL, AU, BH, BU, BY, CR, CZ, FI, GE, GR, HU, LA, MC, NL, PL, RO, SK, SL, YU ( Fig. 33 ).

H. excisa has a widespread Central European distribution, ranging from Germany to Rumania, northwards to N Finland (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b; Ribera et al. 2011).

52. Hydraena integra Pretner 1931

Hydraena (Haenydra) integra Pretner 1931c: 110 .

Male genitalia: Fig. 32d ; female elytral apex: Fig. 32n ; geographic range: Fig. 33 .

Type locality: Georgia, Achalzig (“ Achalzig im Caucasus ”: Pretner 1931c) .

Primary types: Holotype / Lectotype not yet formally designated. Type series in PMSL .

Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.68; PW/PL = 1.36; PW/EW = 0.79.

Diagnosis: Male habitus identical to H. akbesiana ( Fig. 32a ) and allies.

Taxonomic position and diagnostic characters: See differential diagnosis of H. akbesiana .

Habitat: This species usually lives under stones in cold fastflowing streams above 50 m a.s.l.

Chorotype: ANAN (N Anatolian = Pontic Endemic).

Distribution: EUR: GG; AS: TR ( Fig. 33 ).

H. integra has a relatively widespread distribution, ranging from NW Turkey (Pontic Chain) to E Anatolia and SW Georgia (see Appendix 2 for all the detailed known localities).

DNA data: For this species, mtDNA data (COI, 16S rDNA, tRNA leu and NAD1) are available in GenBank ( Trizzino et al. 2011b; Ribera et al. 2011).

53. Hydraena cata d’Orchymont 1936

Hydraena (Haenydra) cata d’Orchymont : 1936: 4.

Male genitalia: Fig. 32e ; female elytral apex: Fig. 32o ; geographic range: Fig. 33 .

Type locality: Turkey, Balikesir province, Tatlasu, 75 m a.s.l. (“Asie Mineure occidentale, presqu’île de Kyzikos [Kapu Dag], dans la mer de Marmara, st. 119, Tatlasu [Ermeniköi]”: d’Orchymont 1936). Primary types: Holotype at ISNB. Measurements: Length: 2.2 – 2.4 mm. EL/EW = 1.68; PW / PL = 1.36; PW /EW = 0.79. Diagnosis: Male habitus identical to H. akbesiana ( Fig. 32a ) and allies. Taxonomic position and diagnostic characters: See differential diagnosis of H. akbesiana . Habitat: This species usually lives under stones in cold fastflowing streams with granitic substrates, above 50 m a.s.l. Chorotype: ANNW ( NW Anatolian Endemic). Distribution: EUR: GR-LESBOS, GR-SAMO; AS: TR ( Fig. 33 ). H. cata is distributed in Lesbos and Samo Islands, and in W Turkey (see Appendix 2 for all the detailed known localities). DNA data: No data.

54. Hydraena phallica d’Orchymont 1930

Hydraena (Haenydra) phallica d’Orchymont 1930a: 375 .

Male genitalia: Fig. 32f ; female elytral apex: Fig. 32p ; geographic range: Fig. 33 .

Type locality: Bulgaria, Varna province, Krapec (“Bulgarie: Krapec”: d’Orchymont 1930a) .

Primary types: Holotype at ISNB.

Measurements: Length: 1.9 – 2.0 mm. EL/EW = 1.68; PW/PL = 1.36; PW/EW = 0.79.

Diagnosis: Male habitus identical to H. akbesiana ( Fig. 32a ) and allies.

Taxonomic position and diagnostic characters: See differential diagnosis of H. akbesiana .

Habitat: This species usually lives under stones in cold fastflowing streams above 300 m a.s.l. HER: Heterotopic species.

Chorotype: BALK (Balkanian Endemic).

Distribution: EUR: AL, BU, GR, MC, RO, TR, YU ( Fig. 33 ).

H. phallica is widely distributed in SE Europe, from Serbia to European Turkey (see Appendix 2 for all the detailed known localities).

DNA data: No data.

Figures

FIGURES 20 a–l. Male habitus in dorsal view of: H. planata (From Jäch & Díaz 2006: Azerbaijan, Gäncä) (a). Aedeagi in right side view of: H. planata (From Jäch & Díaz 2006: Azerbaijan, Gäncä) (b); H. solodovnikovi (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, NE Dagomys) (c); H. krasnodarensis (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, 13 km ENE Sotchi) (d); H. prokini (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, Novorossiysk) (e). Female elytral terminations of: H. planata (From Jäch & Díaz 2006: Azerbaijan, Gäncä) (f); H. solodovnikovi (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, NE Dagomys) (g); H. krasnodarensis (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, 13 km ENE Sotchi) (h); H. prokini (From Jäch & Díaz 2006: Russia, Krasnodarskiy Kray, Novorossiysk) (l). Scale bar = 1 mm (Figs. 20a); = 0.25 mm (Figs. 20b–e). Female elytral terminations not scaled.

FIGURE 21. Geographic distribution of: H. planata; H. solodovnikovi; H. krasnodarensis; H. prokini.

FIGURES 22 a–l. Male habitus in dorsal view of: H. vedrasi (Greece, Evritania, Karpenissi) (a); H. jaechiana (Peloponnesus, Tripoli, Daras) (b); H. epeirosi (Greece, Fthiotida, Gardiki) (c). Aedeagi in right side view of: H. vedrasi (From Audisio et al. 1996: Greece, Evritania, Karpenissi) (d); H. jaechiana (From Audisio et al. 1996: Peloponnesus, Tripoli, Daras) (e); H. epeirosi (From Audisio et al. 1996: Greece, Fthiotida, Gardiki) (f). Female elytral terminations of: H. vedrasi (Greece, Evritania, Anatholios-Fragista) (g); H. jaechiana (Peloponnesus, Tripoli, Castorio) (h); H. epeirosi (Greece, Etolia, Pentakorfos) (l). Scale bar = 1 mm (Figs. 22a–c); = 0.25 mm (Figs. 22d–f). Female elytral terminations not scaled.

FIGURE 23. Geographic distribution of: H. vedrasi; H. jaechiana; H. epeirosi.

FIGURES 24 a–s. Male habitus in dorsal view of: H. gracilis (Italy, Friuli, Cosizza river) (a); H. crepidoptera (Turkey, Sinop, W Yenikonak) (b). Aedeagi in right side view of: H. gracilis (Austria, Niederösterreich) (c); H. gracilidelphis (Spain, Leon, Puerto de Panderrueda) (d); H. graciloides (Turkey, Bolu, Yödigoller N. P.) (e); H. elisabethae (From Jäch 1995a: Greece, Thassos) (f); H. anatolica (Turkey, Kastamonu, Küre Daglari) (g); H. nike (Greece, Samothraki) (h); H. crepidoptera (From Jäch 1995a: Turkey, Sinop, W Yenikonak) (l). Female elytral terminations of: H. gracilis (Italy, Friuli, Stregna) (m); H. gracilidelphis (Spain, Leon, Puerto de Panderrueda) (n); H. graciloides (Turkey, Bolu, Yödigoller N. P.) (o); H. elisabethae (Greece, Thassos) (p); H. anatolica (Turkey, Kastamonu, Küre Daglari) (q); H. nike (Greece, Samothraki) (r); H. crepidoptera (Turkey, Sinop, W Yenikonak) (s). Scale bar = 1 mm (Figs. 24a–b); = 0.25 mm (Figs. 24c–l). Female elytral terminations not scaled.

FIGURE 25. Geographic distribution of: H. gracilis; H. gracilidelphis; H. graciloides; H. elisabethae; H. anatolica; H. nike; H. crepidoptera.

FIGURES 26 a–u. Male habitus in dorsal view of: H. larissae (Italy, Piemonte, Oropa) (a); H. hispanica (Spain, Salamanca, Candelario) (b). Aedeagi in right side view of: H. emarginata (Spain, Leon, Puerto S. Isidro) (c); H. larissae (Italy, Trentino, Grigno; Italy, Piemonte, Oropa) (d–e); H. diazi (Spain, Guipúzcoa, Oiartzun) (f); H. fosterorum (Spain, Burgos, Fresneda de la Sierra) (g); H. hispanica (Spain, Salamanca, Candelario) (h); H. saga (Bosnia, Visegrad) (l); H. alpicola (Slovenia, Valdekom) (m). Female elytral terminations of: H. emarginata (Spain, Leon, Puerto S. Isidro) (n); H. larissae (Italy, Trentino, Stava; Italy, Piemonte, Sagliano) (o–p); H. diazi (Spain, Guipúzcoa, Oiartzun) (q); H. fosterorum (Spain, Burgos, Fresneda de la Sierra) (r); H. hispanica (Spain, Leon, Valdo Prado) (s); H. saga (Slovakia, Muran) (t); H. alpicola (Austria, Scheibbs) (u). Scale bar = 1 mm (Figs. 26a–b); = 0.25 mm (Figs. 26d–m). Female elytral terminations not scaled.

FIGURE 27. Geographic distribution of: H. larissae; H. emarginata; H. diazi; H. fosterorum; H. hispanica; H. saga; H. alpicola.

FIGURES 28 a–g. Male habitus in dorsal view of: H. dalmatina (Montenegro, Staribar) (a). Aedeagi in right side view of: H. dalmatina (From Audisio et al. 1996: Montenegro, Staribar) (b); H. belgica (Austria, Stiria, Purgstall) (c); H. tarvisina (Italy, Veneto, Collalto) (d). Female elytral terminations of: H. dalmatina (Montenegro, Ljuta) (e); H. belgica (Austria, Stiria, Purgstall) (f); H. tarvisina (Italy, Veneto, Collalto) (g). Scale bar = 1 mm (Fig. 28a); = 0.25 mm (Figs. 28b–d). Female elytral terminations not scaled.

FIGURE 29. Geographic distribution of: H. dalmatina; H. belgica; H. tarvisina.

FIGURES 30 a–h. Male habitus in dorsal view of: H. samnitica (Italy, Abruzzo, Orfento river) (a); H. pelops (Greece, Peloponnesus, Vasiliki—Gorani) (b). Aedeagi in right side view of: H. samnitica (Italy, Abruzzo, Pietracamela) (c); H. pangaei (From Audisio et al. 1996: Greece, Kavala, Pangaeon Mt.) (d); H. pelops (Greece, Peloponnesus, Vasiliki—Gorani) (e). Female elytral terminations of: H. samnitica (Italy, Abruzzo, Pietracamela) (f); H. pangaei (Greece, Kavala, Pangaeon Mt.) (g). Female habitus in dorsal view of H. pelops (Greece, Peloponnesus, Vasiliki—Gorani) (h). Scale bar = 1 mm (Figs. 30a,b,h); = 0.25 mm (Figs. 30c–e). Female elytral terminations not scaled.

FIGURE 31. Geographic distribution of: H. samnitica; H. pangaei; H. pelops.

FIGURES 32 a–r. Male habitus in dorsal view of: H. akbesiana (Turkey, Adana, Yarpuz) (a). Aedeagi in right side view of: H. excisa (Austria, Donnerskirchen) (b); H. akbesiana (From Audisio et al. 1993: Turkey, Adana, Yarpuz) (c); H. integra (From Audisio et al. 1996: Turkey, Artvin, Borçka) (d); H. cata (From Audisio et al. 1996: Turkey, Çanakkale) (e); H. phallica (From Audisio et al. 1996: Greece, Etolia, Pentakorfos) (f); H. christinae (From Audisio et al. 1996: Greece, Peloponnesus, Kato Vlasia) (g); H. exasperata (Spain, Castilla, Alcaraz) (h). Female elytral terminations of: H. excisa (Rumania, Ilba) (l); H. integra (Turkey, Istanbul, NE Teke) (m); H. akbesiana (Complete Female habitus: Turkey, Adana, Çatak) (n); H. cata (Turkey, Mugla, Kale) (o); H. phallica (Greece, Evritania, Karpenissi) (p); H. christinae (Greece, Peloponnesus, Kato Vlasia) (q); H. exasperata (Spain, Leon, Pedrosa del Rey) (r). Scale bar = 1 mm (Figs. 32a,n); = 0.25 mm (Figs. 32b–h). Female elytral terminations not scaled.

FIGURE 33. Geographic distribution of: H. excisa; H. akbesiana; H. integra; H. cata; H. phallica; H. christinae; H. exasperata.