Desmopachria surinamensis, 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 surinamensis sp. nov.

Figures 6-8 , 76

Type locality.

Suriname, Sipaliwini District, Raleighvallen Nature Reserve, Voltzberg Trail, 4°40.910'N, 56°11.138'W.

Diagnosis.

This species is similar to members of the Desmopachria apicodente group in having a longitudinal tumidity laterally on the elytron, being extremely broad (TL/GW = 1.3-1.4) and having a very distinctive, flattened bead along the anterior clypeal margin. However, Desmopachria surinamensis lacks the apical tooth on the lateral lobe characteristic of the Desmopachria apicodente group (see below). The male genitalia are distinctive. The median lobe in ventral aspect is elongate, broad, and comprised of long, slender, evenly curved lateral margins with a thin region in between (Fig. 7 ). The apices of the lateral struts are narrowly rounded and proximate with a small emargination in-between (Fig. 7 ).

Description.

Measurements. TL = 1.9-2.0 mm, GW = 1.4-1.5 mm, PW = 1.0-1.1 mm, HW = 0.6-0.7 mm, EW = 0.4-0.5 mm, TL/GW = 1.3-1.4, HW/EW = 1.8-1.9. Body very broad, rounded, laterally broadly curved, lateral margins continuous between pronotum and elytron, body broadest across elytra near midlength of body (Fig. 6 ).

Coloration. Dorsal surface of head and pronotum orange. Elytron red, slightly paler anterolaterally. Head appendages, pro- and mesothoracic legs and ventral surfaces of head and prothorax orange, other ventral surfaces red.

Sculpture and structure. Head broad, anteriorly produced, flattened, anterior margin of clypeus curved, margined with conspicuous, continuous flattened narrow bead; surface of head shiny, finely and sparsely punctate; eyes large (HW/EW = 1.8-19); 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 very short, lateral margins short, slightly curved with continuous narrow bead, of even width throughout length; surface shiny, nearly impunctate medially, punctate around margins, punctation somewhat variable, with few larger punctures. Elytron moderately broad, laterally broadly curved; surface shiny, somewhat more coarsely and evenly punctate than pronotum, punctation fine, some punctures anteromedially on elytron forming moderately distinct longitudinal linear series; laterally with distinctive longitudinal rounded ridge extending posteriorly from humeral angle ~ 1/3 length of elytron. Prosternum extremely short, longitudinally compressed, medially slightly carinate; prosternal process slender anteriorly, with distinctive, small medial tubercle, apically short and broad, medially flattened, apically acutely pointed. Metaventrite broad and evenly smoothly convex medially, surface shiny, impunctate; 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, impunctate. 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 comprised of slender lateral margins between which is a membranous region, in lateral aspect entire median lobe broad, shallowly curved to rounded apex (Fig. 6 ); in ventral aspect, narrow basally, broad medially and apically, lateral margins converging, nearly touching apically, but separated by narrow, curved emargination (Fig. 7 ). Lateral lobe in lateral aspect short, broad, apically attenuated, and curved dorsad, with dense series of long, course setae along ventral margin to apex (Fig. 8 ).

Sexual dimorphism. No clear sexual dimorphic features were discovered.

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

Etymology.

This species is named Desmopachria surinamensis after the country of collection of the type series.

Distribution.

This species is known only from Sipaliwini District, Suriname (Fig. 76 ).

Type material.

Holotype in NZCS, male labeled, "SURINAME: Sipaliwini District 04°40.910'N, 56°11.138'W, 78 m/ Raleighfallen [sic] Nature Reserve Voltzberg trail; margin of stream leg. C. Maier, V. Kadosoe 30.vii.2012; SR12-0730-01A/ SEMC1114775 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria surinamensis Miller, 2021 [red label with black line border]." Paratypes, 7, in SEMC and MSBA labeled same as holotype except with different SEMC barcode numbers (Table 1 ) and each with “/… PARATYPE Desmopachria surinamensis 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.