Desmopachria emarginata, Miller, 2022

Miller, Kelly B., 2022, Nineteen new species of Desmopachria Babington, 1841 (Coleoptera, Adephaga, Dytiscidae, Hydroporinae, Hyphydrini) with notes on the taxonomy of the genus, ZooKeys 1136, pp. 1-56 : 1

Desmopachria emarginata sp. nov.

Figures 54-56 , 80

Type locality.

Suriname, Sipaliwini District, Tafelberg Summit, near Augustus Creek Camp, pond on trail into Arrowhead Basin, 3°55.600'N, 56°11.300'W.

Diagnosis.

This species includes some of the largest specimens in the group (TL = 2.0-2.2 mm). The elytra are more distinctly punctate than most species with distinctive dual punctation. Also, the elytra are very noticeably iridescent in most specimens, but a series from Raleighfallen Nature Preserve, Sipaliwini District, Suriname (NZCS) are less conspicuously iridescent. These specimens are similar in size, punctation and male genitalia, however. The male genitalia are most similar to Desmopachria impunctata , but the apical emargination in the median lobe is relatively deeper and in lateral aspect the apex is not distinctly hooked ventrad (Figs 54 , 55 vs. Figs 60 , 61 ). Also, Desmopachria emarginata are larger (TL = 2.0-2.2 mm) than Desmopachria impunctata (TL = 1.8-1.9 mm).

Description.

Measurements. TL = 2.0-2.2 mm, GW = 1.4-1.5 mm, PW = 1.1-1.2 mm, HW = 0.7-0.8 mm, EW = 0.4-0.5 mm, TL/GW = 1.4-1.5, HW/EW = 1.8-1.9. Body very broadly oval, laterally broadly curved, lateral margins nearly continuous between pronotum and elytron.

Coloration. Head orange. Pronotum pale orange, in a majority of specimens paler in color than head or elytron. Elytron evenly brownish orange, strongly iridescent. Ventral surface of head, prosternum, head appendages, and pro- and mesolegs pale orange, other ventral surfaces and metalegs orange.

Sculpture and structure. Head broad, short; anterior margin of clypeus broadly curved, flattened, finely margined with conspicuous, continuous narrow bead, particularly evident medially; surface of head shiny, extremely finely and sparsely punctate; eyes large (HW/EW = 1.8-1.9); antennae short, scape and pedicel relatively large and rounded, flagellomere III long and slender, apically expanded, antennomeres IV-X short and broad, antennomere XI elongate, apically pointed. Pronotum short, lateral margins short, slightly curved with continuous marginal bead; surface shiny, impunctate medially, but laterally and posteriorly with fine punctation. Elytron broad, laterally broadly curved and rounded; surface shiny, prominently punctate, punctures dual, some larger, some smaller, interspersed. Prosternum extremely short, longitudinally compressed, medially carinate; prosternal process in male very slender anteriorly, with low, indistinct medial tubercle, bifid apically with deep medial pit, in female slender anteriorly, with distinctive, small medial tubercle, apically short and broad, medially slightly carinate, apically acutely pointed. Metaventrite broad and evenly smoothly convex medially, surface shiny, impunctate or with few extremely minute punctures laterally; metaventrite wings extremely slender. Metacoxa with medial portion short, ~ 1/3 length of metaventrite medially, metacoxal lines slightly sinuate, divergent anteriorly; lateral portion of metacoxa extremely large, anteriorly strongly expanded; surface shiny, impunctate or with few extremely fine punctures. Metatrochanter very large, subequal to length of ventral margin of metafemur; legs otherwise not noticeably modified. Abdomen with surfaces shiny and smooth, impunctate, some specimens with few very fine punctures.

Male genitalia. Male median bilaterally symmetrical, in lateral aspect elongate, evenly broad, evenly and broadly curved on both dorsal and ventral margins, apex linear and apically broadly rounded (Fig. 54 ); in ventral aspect broad basally, apically broad, lateral margins irregularly sublinear, apex broad, medially deeply emarginate, emargination ~ 2/5 length, apical branches each apex with small process extending medially (Fig. 55 ). Lateral lobe very broad medially, ventral margin broadly rounded, apex narrowed to small lobe, with series of long setae apically and along apicodorsal margins (Fig. 56 ).

Sexual dimorphism. Male pro- and mesotarsomeres I-III slightly more broadly expanded and with ventral adhesive setae. Male and female prosternal processes different as in all Desmopachria portmanni group species.

Variation. Specimens vary in intensity of coloration and degree of difference between head, pronotum and elytron, but not strongly so.

Etymology.

This species is named Desmopachria emarginata , Latin for the apical emargination in the male median lobe.

Distribution.

This species is known from localities in Guyana, Suriname, and Venezuela (Fig. 80 ).

Type material.

Holotype in NZCS, male labeled, "SURINAME: Sipaliwini District 3°55.600'N, 56°11.300'W, 600m CSNR: Tafelberg Summit, nr Augustus Creek Camp, pond on trail into Arrowhead basin leg. Short & Bloom; 16.viii.2013 SR13-0816-02A/ SEMC0930719 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria emarginata Miller, 2021 [red label with black line border]." Paratypes, 153 specimens in CSBD, MIZA, MSBA NCZS, and SEMC each with paratype label, “… / PARATYPE Desmopachria emarginata Miller, 2021 [blue label with black line border]" and different barcode labels (Table 1 ); 43 labeled same as holotype; 2 in SEMC labeled, "GUYANA: Region IX 2°09.557'N, 59°17.569'W, 268m along road to Parabara forest pools near Mushai Wao leg. Short, Isaacs, Salisbury 1.xi.2013; GY13-1101-02A/ …”; 3 in SEMC labeled, "GUYANA: Region IX 2°47.417'N, 59°53.986'W, 113m Kusad Mts., Taraara Wao creek margin & isolated side pools leg. Short, Isaacs, Salisbury 28.x.2013; GY13-1028-01A/ …”; 2 in SEMC labeled, "GUYANA: Region IX 2°06.311'N, 59°14.072'W, 267m Parabara, N. side of river small detrital pool in forest leg. A.E.Z. Short; 2.xi.2013 GY13-1103-01A/ …”; 3 in SEMC labeled, "GUYANA: Region 6 4°45.301'N, 58°00.404'W, 49 m Upper Berbice Basecamp 2 shallow detrital pool in forest draining into creek; leg. Short, Salisbury, La Cruz; 26.ix.2014 GY14-0926-01A/ …”; 9 in SEMC labeled, "GUYANA: Region XIII [sic] 4.988650°N, 59.57890°W, 427 m Chenapau Village, trail between airstrip & town; large pool with lots of detritus; leg. A. Short 14.iii.2014; GY14-0314-03A/ …”; 33 in CSBD and SEMC labeled, "GUYANA: Region XIII [sic] 5°10.514'N, 59°28.970'W, 440 m Kaieteur Nat’l Park, trail by guest house; small forest stream leg. A. Short; 15.iii.2014 GY14-0315-03A/ …”; 7 in SEMC labeled, "GUYANA: Region XIII [sic] 4.98650°N, 59.57890°W, 427 m Chenapau village, between airstrip & town, small pools along trail leg. Short & Baca; 10.iii.2014 GY14-0310-01A/ …”; 4 in SEMC labeled, "SURINAME: Sipaliwini District 3°47.479'N, 56°08.968'W, 320m CSNR: near Kappel airstrip forested stream & stream pools leg. Short & Bloom; 24.viii.2013 SR13-0824-03A/ …”; 15 in NZCS and SEMC labeled, "SURINAME: Sipaliwini District 3°53.942'N, 56°10.849'W, 733m CSNR: Tafelberg Summit, nr. Caiman Crk Camp; dipnetting by stream margins: leg. Bloom 20.viii.2013, SR13-0820-02A/ …”; 1 in SEMC labeled, "SURINAME: Sipaliwini District 2°10.973'N, 56°47.235'W, 210 m Camp 2, on Silpaliwini [sic] River; Short & Kadosoe; small detrital stream 28.viii.2010; SR10-0828-03A 2010 CI-RAP Survey/ …”; 20 in NZCS labeled, "SURINAME: Sipaliwini District 3°55.600'N, 56°11.300'W, 600m CSNR: Tafelberg Summit, nr Augustus Creek Camp, pond on trail into Arrowhead basin leg. Short & Bloom; 16.viii.2013 SR13-0816-02A/ …”; 7 in SEMC labeled, "SURINAME: Sipaliwini District 04°40.910'N, 56°11.138'W, 78 m Raleighfallen Nature Reserve Voltzberg trail; Margin of stream leg. C. Maier, V. Kadosoe 30.vii.2012; SR12-0730-01A/ …”; 3 in MIZA and SEMC labeled, "VENEZUELA: Bolívar State 4°28.233'N, 61°35.559'W, 867 m Gran Sabna, Pauji: Esmeraldes 16.vii.2010;leg. Short, Tellez, Arias detrital pools by forested stream VZ10-0716-02A/ …”; 1 in SEMC labeled, "VENEZUELA: Bolívar State 5°50'49.2"N, 61°28'2.4"W, 1340 m Rio Aponwao @ Hwy 10 31.vii.2008; leg. A.Short, M. García AS-08-060a; small vegetated pool/ …”.

Figures

Figures 51 - 71. Desmopachria species. (51 - 53) Desmopachria angulata 51 median lobe, right lateral aspect 52 median lobe, ventral aspect 53 right lateral lobe, right lateral aspect (54 - 56) Desmopachria emarginata 54 median lobe, right lateral aspect 55 median lobe, ventral aspect 56 right lateral lobe, right lateral aspect (57 - 59) Desmopachria imparis 57 median lobe, right lateral aspect 58 median lobe, ventral aspect 59 right lateral lobe, right lateral aspect (60 - 62) Desmopachria impunctata 60 median lobe, right lateral aspect 61 median lobe, ventral aspect 62 right lateral lobe, right lateral aspect (63 - 65) Desmopachria truncata 63 median lobe, right lateral aspect 64 median lobe, ventral aspect 65 right lateral lobe, right lateral aspect (66 - 68) Desmopachria bisulcata 66 median lobe, right lateral aspect 67 median lobe, ventral aspect 68 right lateral lobe, right lateral aspect (69 - 71) Desmopachria irregulara 69 median lobe, right lateral aspect 70 median lobe, ventral aspect 71 right lateral lobe, right lateral aspect.

Figures 79, 80. Desmopachria species distributions. 79 Desmopachria nitida species group and Desmopachria portmanni-aldessa species group 80 Desmopachria portmanni-aldessa species group.