Desmopachria divergens, 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 divergens sp. nov.

Figures 1 , 2 , 76

Type locality.

Venezuela, Amazonas State, Communidad Caño Gato on Rio Sipapo, 4°58.838'N 67°44.341'W.

Diagnosis.

This species is characterized by dorsal iridescence and the shape of the male genitalia. The male median lobe in ventral aspect is extremely broad and apically very broadly truncate combined with lateral lobes with the apices strongly curved laterad and divergent (Fig. 2 ). This species is dorsally iridescent but lacks the bifurcate prosternal process of the Desmopachria portmanni species group. This makes it somewhat similar to specimens in the Desmopachria ubangoides species group, but Desmopachria divergens lacks the sexually dimorphic anterior clypeal margins of that group (males with the margin flattened and upturned, females beaded, but not as strongly modified ( Miller 2001; Young 1980).

Description.

Measurements. TL = 1.8-2.0 mm, GW = 1.1-1.2 mm, PW = 0.9-1.0 mm, HW = 0.6-0.7 mm, EW = 0.3-0.4 mm, TL/GW = 1.6-1.7, HW/EW = 2.1-2.2. Body elongate oval, laterally broadly curved, lateral margins somewhat discontinuous between pronotum and elytron, body broadest across elytra at midlength of body (Fig. 1 ).

Coloration. Dorsal surface of head and pronotum evenly yellow-orange. Elytron evenly orange-brown, distinctly iridescent. Ventral surfaces orange, slightly darker medially on metathorax, medially slightly iridescent.

Sculpture and structure. Head moderately broad, anteriorly rounded with anterior clypeal margin with narrow, continuous bead; surface of head shiny, finely and sparsely punctate; eyes large (HW/EW = 2.1-2.2); antennae short, scape and pedicel relatively large and rounded, flagellomere III long and slender, apically expanded, antennomeres IV-X short and broad, lobed at anterodorsal angle, antennomere XI elongate, apically pointed. Pronotum moderately short, lateral margins short, distinctly curved with continuous narrow bead, similar width throughout; surface shiny, very finely, evenly punctate. Elytron moderately broad, laterally broadly curved; surface shiny, more coarsely and evenly punctate than pronotum, punctation distinctive and prominent, densely and evenly punctate. Prosternum extremely short, longitudinally compressed, medially slightly carinate; prosternal process slender anteriorly, with distinctive, small medial tubercle, apically short and broad, medially flattened, apically broadly rounded. Metaventrite broad and evenly smoothly convex medially, surface shiny, finely, sparsely, and evenly punctate; metaventrite wings extremely slender. Metacoxa with medial portion short, <1/3 length of metaventrite medially, metacoxal lines slightly divergent anteriorly; lateral portion of metacoxa extremely large, anteriorly strongly expanded; surface shiny, finely, sparsely, and evenly punctate. Metatrochanter large, subequal to length of ventral margin of metafemur; legs otherwise not noticeably modified. Abdomen with surfaces shiny and smooth, very finely and sparsely punctate.

Male genitalia. Male median lobe in ventral aspect very broad, lateral margins linear to very broad, truncate apex (Fig. 2 ). Lateral lobe in ventral aspect slender, medially constricted on medial margin, apically slender, strongly curved laterad, apex narrowly rounded (Fig. 2 ).

Sexual dimorphism. No obvious sexual dimorphic features were discovered.

Variation. No characteristic variation was examined among the specimens examined.

Etymology.

This species is named Desmopachria divergens , Latin for divergent, for the apically distinctly divergent lateral lobes (Fig. 2 ).

Distribution.

Specimens are only known from the type locality, Caño Gato, Amazonas, Venezuela (Fig. 76 ).

Type material.

Holotype in MIZA, male labeled, "VENEZUELA: Amazonas State 4°58.838'N, 67°44.241'W, 95m Communidad Caño Gato, on Rio Sipapo; 16.i.2009; leg. Short, Miller, Camacho, Joly, & García VZ09-0116-01Z: along stream/ SM0843057 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria divergens Miller, 2021 [red label with black line border]." Paratypes, 19 in MIZA, MSBA, and SEMC labeled same as holotype except different barcode labels (Table 1 ) and each with “/… PARATYPE Desmopachria divergens Miller, 2021 [blue label with black line border."

Figures

Figures 1 - 12. Desmopachria species. (1, 2) Desmopachria divergens 1 habitus 2 male genitalia, ventral aspect. (3,4) Desmopachria lineata 1 habitus 2 male genitalia ventral aspect (5 - 8) Desmopachria surinamensis 5 habitus 6 - 8 male genitalia 6 median lobe, right lateral aspect 7 median lobe, ventral aspect 8 right lateral lobe, right lateral aspect (9 - 12) Desmopachria tenua 9 habitus 10 median lobe, right lateral aspect 11 median lobe and right lateral lobe, ventral aspect; 12 right lateral lobe, right lateral aspect. Scale bars: 1.0 mm for habitus drawings.

Figures 76, 77. Desmopachria species distributions. 76 ungrouped Desmopachria species 77 Desmopachria apicodente species group.