Desmopachria lachesis Miller and Wolfe, 2019

Miller, Kelly B. & Wolfe, G. William, 2019, Three New Species in the Desmopachria striola Species-Group of Desmopachria Babington, 1841 (Coleoptera: Adephaga: Dytiscidae: Hydroporinae: Hyphydrini), The Coleopterists Bulletin 73 (3), pp. 621-628 : 627

Desmopachria lachesis Miller and Wolfe , new species

Zoobank.org/ urn:lsid:zoobank.org:act:8CBB8A2F-8937-4DDC-A8D4-E2748BB1245 ( Figs. 9–12 , 26 )

Type Locality. Venezuela, Monagas, S of Maturin, Morichal at road crossing, 9.2733° N, 62.93743333° W .

Diagnosis. This species is similar to D. clotho , D. atropos , and D. striola , but the median lobe in lateral aspect is distinctly and uniquely sinuate apically ( Fig. 9 ). Specimens have brown-orange elytra with a darker longitudinal region medially between the elytral suture and the elytral stria.

Description. Measurements: TL = 1.5–1.7 mm, GW = 1.0– 1.1 mm, PW = 0.8–0.9 mm, HW = 0.5–0.6 mm, EW = 0.2–0.3 mm, TL/GW = 1.5–1.6, HW/EW = 2.0–2.1. Coloration: Head and pronotum yellow-orange, posterior margin of pronotum medially narrowly brown. Elytron brown-orange, darker medially along sutural stria; surface not iridescent. Head appendages, legs, and ventral surfaces yellow to yellow-orange. Sculpture and structure: Head broad, short; anterior margin of clypeus finely margined with continuous narrow bead; surface of head shiny, very finely and sparsely punctate; eyes large (HW/EW = 2.0–2.1); antennae short, antennomeres III–X short, moderately broad, antennomere XI elongate, apically pointed. Pronotum short, broad, laterally distinctly curved with continuous narrow bead; surface shiny, very finely and sparsely punctate, without basal striae. Elytron broad, laterally broadly curved; surface shiny, very finely and sparsely punctate, without basal stria but with distinctive longitudinal sutural stria. Prosternum short, longitudinally compressed; prosternal process short, broad, without medial ventral tubercle, apically broadly triangular. Metaventrite broad and evenly smoothly convex medially, surface shiny, impunctate; metaventrite wings extremely slender. Metacoxa with medial portion short, less than half length of metaventrite medially, metacoxal lines subsinuate, divergent anteriorly; lateral portion of metacoxa very large, anteriorly strongly expanded; surface shiny, impunctate. Metatrochanter very large, subequal to length of ventral margin of metafemur; legs otherwise not noticeably modified. Abdominal surface shiny and smooth, very finely and sparsely punctate. Male genitalia: Median lobe in lateral aspect very slender throughout length, apically strongly sinuate and strongly narrowed to sharply pointed, dorsally directed apex ( Fig. 9 ); in ventral aspect, with large, broad basal region, abruptly constricted medially, apical portion with lateral margins curved, convergent to apex that is moderately deeply and narrowly emarginate, each ramus moderately slender and apically convergent and pointed ( Fig. 10 ). Lateral lobe in lateral aspect broad with margins subparallel to distinctly narrowed apical region that is extremely slender, bent dorsad, and apically sharply pointed ( Fig. 11 ); in ventral aspect, elongate, moderately broad, apically slightly expanded to truncate apex ( Fig. 12 ).

Etymology. This species is named lachesis (allotter), one of the three Greek fates.

Distribution. The species is known from lowland northern Venezuela through Guyana to central Suriname ( Fig. 26 ).

Habitat. Desmopachria lachesis was collected mainly in lentic marshes and pools but also slow portions of streams and morichal margins.

Type Material. Holotype in MIZA, male labeled “ VENEZUELA: Monagas State 9°16.398 0 N, 62°56.246 0 W, 22 m 2.ii.2010; S. of Maturin leg. Short, Garcia, & Joly Morichal margin; VZ10- 0202-02A/ SEMC0893241 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria lachesis Miller and Wolfe, 2017 [red label with black line border].” Paratypes, 111: Three labeled same as holotype; one labeled “ GUYANA: Region IX 2°50.955 0 N,59°58.363 0 W, 115m nr. Kusad Mts., vegetated pond leg. Short, Isaacs , Salisbury 27.x.2013; GY13-1027-02A”; one labeled “ GUYANA:Region IX 2°52.204 00 N,59°55.003 0 W, 124m large shallow lagoon/ marsh nr. Kusad Mts ; leg Short , Isaacs , Salisbury 26.x.2013 GY13-1026-03A”; 11 labeled “ GUYANA: Region IX 2°51.193 0 N,59°55.336 0 W, 117m nr. Kusad Mts. , muddy margins of vegetated farm ponds leg. A. Short; 28.x.2013 QY13-1028-02A”; two labeled “ GUYANA: Region IX 2°59.955 0 N,59°58.363 0 W, 115m nr. Kusad Mts. , vegetated pond 27.x.2013; GY13-1027-07A”; 20 labeled “ GUYANA: Region IX 2°49.793 0 N,59°48361 0 W, 123m Zilda Karisihizi (lake), nr Kusad Mts. , large vegetated marsh leg. Short, Isaacs , Salisbury 25.x.2013: Gy 13-1025-01A”; 25 labeled “ GUYANA: Region IX 2°48.724 0 N,59°48.546 0 W, 121m Zilda Wao Creek , nr. Kusad Mts. Stagnant vegetated creek leg. Short, Isaacs , Salisbury 25.x.2013; GY13-1025-02A”; four labeled “GUAYANA” Region IX 2°53.412 0 N,59°51.042 0 W, 114m Katu Wao River nr. Kusad Mts. Margins of vegetated creek leg. Short, Isaacs , Salisbury 26.x.2013: GY13-1026-01A”; six labeled “ GUYANA: Region IX 2°50.563 0 N,58°59.113W, 108m trib. of Takatu River , NW of Kusad Mts.; creek margins leg. Short, Isaacs , Salisbury 24.x.2013; GY13- 1024-02B”; seven labeled “GUAYANA: Region IX 2°52.204 0 N,59°55.003 0 W 124m nr. Kusad Mts. , marshy area leg. Short, Isaacs , Salisbury 27.x.2013; GY13- 1027-01A”; seven labeled “ GUYANA: Region IX 2°53.412 0 N,59°51.042 0 W, 114m Katu Wao River , nr. Kusad Mts. Large side pools of main river leg. Short, Isaacs , Salisbury 26.x.2013; GY13-1026-01C”; two labeled “ SURINAME: Sipaliwini District N°2.47700, W° 62941, 275 m Camp 1, Upper Paumeu leg. A. Short; UV light by camp 14.iii.2012; SR12-0314-LT1 2012 CI-RAP Survey ”; four labeled “ SURINAME: Sipaliwini District N 2.47700 0, W 55.6294 0, 275 m Camp 1, Upper Palumeu River leg. A. Short; large detrital pools 1-12.iii.2012; SR12-0310-01A 2012 CI-RAP Survey”; nine labeled “ SURINAME: Sipaliwini District N 2.47700 0 W 55.62941 0, 275 m Camp 1, Upper Palumeu leg. A. Short; large pool by trail 11.iii.2012; SR12-0311- 01A 2012 CI-RAP Survey”; one labeled “VEN- EZUELA: Guarico State 8°31.705 0 N, 66°22.602 0 W, 145m c. 65 km S Las Mercedes, 9.i.2009; leg. Short, Miller, Garci & Camacho; large lagoo w/ vegl: VZ09- 0109-01X”; one labeled “ VENEZUELA: Monagas State 8°46.439 0 N,62°14.306 0 W, 19 m between Tucupta & Tembledor 3.ii.2010; leg. Short, Garcia, Joly pond margin; VZ10-0203-02A”; one labeled “ VENEZUELA: Monagas State 9°16.398 0 N,62°56.246 0 W, 22 m 2.ii.2010; S. of Madurin leg. Short, Garcia & Joly Morichal margin; VZ10-0202-02A”; three labeled “ VENEZUELA:MonagasState9°36.591 0 N,63°8.295 0 W 45 m S. of Madurin; vegetated river/ morichal margin; 2.ii.2010; leg. Short & Garcia; VZ10-0202-01B”; four labeled, “ VENEZUELA: Bolivar State 07°23 0 09.4 00 N,61°19 0 52.5 00 W, 177m E. Tumeremo, road to Bochinche 13.vii.2010; leg, Short, Tellez, Aries pools along road; VZ10-0713-03A”; six labeled “ VENEZUELA: Sucre State 10°31.419 0 N, 63°07.070 0 W, 2 m ca. 5 km SE EL Pilar, 29.i.2010 leg. Short & Garcia; forested swamp by road; VZ10-0129- 04A”. Each paratype with different specimen barcode labels ( Table 1) and each with “… PARATYPE Desmopachria lachesis Miller and Wolfe, 2017 [blue label with black line border].”

Figures

Figs. 1–24. Desmopachria species. 1) D. atropos, habitus; arrow indicates sutural stria; scale bar = 1.0 mm. Male genitalia: D. atropos: 2–3) Median lobe, right lateral and ventral aspects, respectively; 4–5) Right lateral lobe, right lateral and ventral aspects, respectively. D. clotho: 6) Median lobe, right lateral aspect; 7) Median and right lateral lobes, ventral aspect; 8) Right lateral lobe, right lateral aspect. D. lachesis: 9–10) Median lobe, right lateral and ventral aspects, respectively; 11–12) Right lateral lobe, right lateral and ventral aspects, respectively. D. amyae, redrawn from Miller (2001): 13) Median and left lateral lobes, dorsal aspect; 14) Median lobe, right lateral aspect; 15) Right lateral lobe, right lateral aspect. D. chei, redrawn from Miller (1999): 16) Median and lateral lobes, dorsal aspect; 17) Right lateral lobe, right lateral aspect. D. fossulata, redrawn from Young (1990): 18) Median and lateral lobes, ventral aspect. D. grouvellei, redrawn from Young (1990): 19) Median and lateral lobes, ventral aspect. D. ruginosa, redrawn from Young (1990): 20–21) Median and lateral lobes, ventral and right lateral aspects, respectively. D. striola: 22) Median lobe, right lateral aspect; 23) Median and right lateral lobes, ventral aspect; 24) Right lateral lobe, right lateral aspect.

Figs. 25–26. Distribution of new Desmopachria species.