Labidostomis (Labidostomis) longimana ( Linnaeus, 1760 )

Regalin, Renato, 2017, A review of Labidostomis species similar to L. longimana from southeastern Europe with descriptions of two new species from Greece and Turkey (Coleoptera: Chrysomelidae: Cryptocephalinae: Clytrini), Zootaxa 4317 (2), pp. 321-337 : 326-327

Labidostomis (Labidostomis) longimana ( Linnaeus, 1760)

( Figs 7 , 12 , 18 , 24 , 30 , 36 )

Chrysomela longimana Linnaeus, 1760: 170 (original description).

Type locality. “Svecia”.

Types examined. Not examined. The photographs of two Linnean specimens (♂ and ♀, probably syntypes) are available at the pages of the Linnean Society of London: http://linnean-online.org/insects.html.

Additional specimens examined. 51 specimens — CROATIA: Sisak, 2 ♂♂, J. Fleischer leg. ( NMPC) ; Skrad , vii.1913, 1 ♂ 2 ♀♀, J. Obenberger leg ( NMPC) ; Env. d´ Agram [= Zagreb ], 1874, 7 ♂♂ 13 ♀♀, Brusina leg. ( IRSB) . GREECE: Graecia , 1 ♂, Krüper leg. ( NMPC) ; Central Macedonia: Chalkidiki, Arnaia, 40°28´N 23°32´E, 700 m, 3. vii.2014, 1 ♀, Z. Kraus leg. ( ZKCM) . ROMANIA: Dobrogea, Mangalia, 15.–18. vii.1969, 1 ♂ 1 ♀, Král leg. ( NMPC) ; Banat , 1 ♂, Reitter leg. ( NMPC) . BULGARIA: Sozopol , 26.vi.–3. vii.1976, 1 ♂ ( NMPC) ; Varna, vi.1934, 2 ♂♂, Purkyně leg. ( NMPC) . SERBIA: Mladenovac , 3. vi.1947, 1 ♂, exp. Nat. Mus. leg. ( NMPC) . MONTENEGRO: Žabljak, Riblje lake , 1. vii.1958, 1 ♂ 1 ♀, Mařan & Hoberlandt leg. ( NMPC) ; Radostak Mt. , 1 ♂ 1 ♀, J. Obenberger leg. ( NMPC) . SLOVENIA: Kranjska Gora, 1 ♂ 1 ♀, Štěrba leg. ( NMPC) . BOSNIA AND HERCEGOVINA: Cvrsnica , 1 ♂, Štepánek leg. ( NMPC) . TURKEY: Izmir vil.: Zeitindag , vii.1973, 1 ♂, M. & G. Osella leg. ( MSNV) ; Bolu vil.: Abant Gölü , 1400–1600 m, 3. vii.1972, 3 ♂♂ 2 ♀♀, M. & G. Osella leg. ( MSNV) ; Abant Gölü , vii.1973, 1 ♂ 1 ♀, M. & G. Osella leg. ( MSNV) ; Abant , 1000 m, 21. vi.1975, 3 ♂♂, Osella leg. ( MSNV) .

Additions to description. Body length: ♂♂ 4.3–7.5 mm; ♀♀ 4.0–7.0 mm.

Colouration. Labrum dark. Elytra with small blurred dark spot on humerus, spot can be indistinct or, rarely, missing.

Mandibles ( Fig. 24 ). Mandibles small, distinctly constricted preapically, with sharp dorsal keel. Inner slopes slightly concave, the angle between lateral and apical parts of inner margins is relatively sharp, about 90° thus apical part of inner margin is nearly transverse.

Antennae ( Fig. 30 ). Antennomere IV subparallel, ca. 1.47 times as long as wide.

Aedeagus ( Fig. 7 ). Apical quarter convergent with slightly concave margins, apex triangular with narrowly rounded tip. Dorsal median impression semi-elliptical, distinct, concave, with or without not well developed median keel. Apex of aedeagus without inward triangular crooked folds. Operculum trapezoidal with anterior margin incised in middle. Visible part of non-everted anterior sclerite transverse, thin, with small short triangular process in the median part. In lateral view, ventral side of aedeagus moderately convex.

Everted aedeagus ( Fig. 18 ). Ejaculatory guide with large lateral arms with anterior apices directed inwards, base in middle with two distinct triangular processes, in lateral view with two arms coiled backwards. Lateral sclerites large, transversely subtriangular with apices slightly hooked. Anterior sclerite transverse with distinct Ushaped incision in middle of anterior margin.

Spermatheca ( Fig. 12 ). Vasculum C-shaped with base moderately widened. Bulbus transverse, very short, with two convexities, first for glandular insertion, second for insertion of ductus spermathecae. Ductus spermathecae ca 2.5 times longer than vasculum, without coils, but with two or three simple loops. Bursa copulatrix with small sclerotized plate near entrance of ductus spermathecae.

Distribution. Europe, Caucasus, Turkey, Middle Asia, Siberia ( Regalin & Medvedev 2010).

Differential diagnosis. The males of L. longimana have mandibles constricted preapically with inner margin forming sharp angles. Apex of aedeagus is without inward triangular crooked folds what separates L. longimana from the similar species L. balcanica , L. graeca and L. daccordii sp. nov. ( Figs 5–7 , 9 ).

Comments. Labidostomis longimana is a widely distributed species with several synonyms which were time to time treated as varieties or even subspecies what concerns mainly L. longimana ssp. caucasica Medvedev, 1962 and L. longimana var. dalmatina ( Lacordaire, 1848) . Labidostomis longimana ssp. caucasica is geographically outside the extent of the present study. The identity of L. longimana var. dalmatina , described from Dejean´s collection, is unknown to date as the deposition the types is unknown to us. We cannot exclude that this variety can refer to L. balcanica as both were described from former Dalmatia. The description of var. dalmatina is very short, uninformative and refers to very variable characters, like frons less impressed, vertex less sculptured and pronotum covered with larger and more impressed punctures (all in comparison with typical L. longimana ). We avoid designation of a neotype because there is still some chance to trace it at other institutions, therefore, provisionally we leave L. balcanica as a valid species and var. dalmatina in synonymy with L. longimana in agreement with Palaearctic catalogue ( Regalin & Medvedev 2010).

Figures

FIGURES 5 – 8. Aedeagus in dorsal, lateral and ventral views. 5 — Labidostomis balcanica; 6 — L. graeca; 7 — L. longimana; 8 — L. tymphristica. Scale bar: 0.5 mm.

FIGURES 11 – 15. Spermatheca. 11 — Labidostomis balcanica; 12 — L. longimana; 13 — L. tymphristica; 14 — L. daccordii sp. nov.; 15 — L. leonardii sp. nov. Scale bar: 0.25 mm.

FIGURES 16 – 18. Aedeagus with everted internal sac. 16 — Labidostomis balcanica; 17 — L. graeca; 18 — L. longimana. Not to scale.

FIGURES 22 – 27. Head and mandibles in frontal view. 22 — Labidostomis balcanica; 23 — L. graeca; 24 — L. longimana; 25 — L. tymphristica; 26 — L. daccordii sp. nov.; 27 — L. leonardii sp. nov. Not to scale.

FIGURES 28 – 33. Right male antenna. 28 — Labidostomis balcanica; 29 — L. graeca; 30 — L. longimana; 31 — L. tymphristica; 32 — L. daccordii sp. nov.; 33 — L. leonardii sp. nov. Not to scale.

FIGURES 34 – 39. Male habitus. 34 — Labidostomis balcanica (holotype, 7.6 mm); 35 — L. graeca (holotype, 6.7 mm); 36 — L. longimana (Bulgaria, 5.8 mm); 37 — L. tymphristica (holotype, 5.9 mm); 38 — L. daccordii sp. nov. (paratype, 6.5 mm); 39 — L. leonardii sp. nov. (holotype, 6.3 mm).

FIGURES 9 – 10. Aedeagus in dorsal, lateral and ventral views. 9 — Labidostomis daccordii sp. nov.; 10 — L. leonardii sp. nov. Scale bar: 0.5 mm.