Desmopachria atropos 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 : 623

Desmopachria atropos Miller and Wolfe , new species

Zoobank.org/ urn:lsid:zoobank.org:act:FC10B449-B330-48CE-BA1B-D1E42F0FAD96 ( Figs. 2–5 , 25 )

Type Locality. Venezuela, Barinas State , ca 13 km SE Ciudad Bolivia , 8°19.394 0 N, 70°28.238 0 W.

Diagnosis. This species differs from others in the group by the shape of the male genitalia. The median lobe is elongate and apically obliquely bent with the apex straight in lateral aspect ( Fig. 2 ). In ventral aspect, the median lobe is broad, laterally broadly rounded, and apically convergent to narrowly produced and pointed ( Fig. 3 ). Specimens are evenly orange on the dorsum of the head and pronotum and orange-brown on most of the elytra with the region between the suture; the sutural stria darker. In size and coloration, D. atropos is similar to Desmopachria lachesis Miller and Wolfe , new species, which has the median lobe apically strongly sinuate in lateral aspect and in ventral aspect with the apical rami laterally rounded and apically pointed with a distinct, deep medial emargination ( Fig. 10 ).

Description. Measurements: TL = 1.5–1.6 mm, GW = 1.0– 1.1 mm, PW = 0.8–0.9 mm, HW = 0.5 mm, EW = 0.2–0.3 mm, TL/GW = 1.4–1.5, HW/ EW = 2.1. Coloration: Head and pronotum yelloworange, 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 = 2.1); 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 slender but expanded medially, apically narrowed and obliquely bent dorsad, apical portion straight, apex slightly rounded ( Fig. 2 ); in ventral aspect, narrow basally, widened to medial half, with distinct constriction submedially, apical portion broad, lateral margins broadly rounded to broadly pointed apex, apical portion medially deeply emarginate ( Fig. 3 ). Lateral lobe in lateral aspect broad throughout most of length, apically very slender and bent obliquely dorsad, bent portion slender to sharply pointed apex ( Fig. 4 ); in ventral aspect, moderately broad throughout length, apex broadly rounded ( Fig. 5 ).

Etymology. This species is named atropos (unturnable), one of the three Greek fates.

Distribution. Desmopachria atropos is known only from one locality in Barinas State in western Venezuela ( Fig. 25 ).

Habitat. The type series was collected from a “marsh.”

Type Material. Holotype in MIZA, male labeled “ VENEZUELA: Barinas State 8°19.394 0 N, 70°28.238 0 W, 173m ca. 13 km SE Ciudad Bolivia leg. Short, Arias, & Gustafson marsh; 25.i.2012; VZ12-0125-02A/ SEMC1030664 KUNHM-ENT [label with barcode]/ HOLOTYPE Desmopachria atropos Miller and Wolfe, 2017 [red label with black line border].” Paratypes: Four labeled same as holotype except with different specimen barcode labels ( Table 1) and each with “… PARATYPE Desmopachria atropos 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.