Desmopachria bisulcata, 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 bisulcata sp. nov.

Figures 66-68 , 81

Type locality.

Suriname, Sipaliwini District, Camp 3, Werehpai, SE Kwamala, 2°22.259'N 56°41.227'W, 229m.

Diagnosis.

This species has a relatively simple median lobe that is slender, elongate, and curved in lateral aspect, and broad basally and apically evenly narrowed to a narrowly rounded apex in ventral aspect (Figs 66 , 67 ). The lateral lobe is small and slender in lateral aspect, and much shorter than the median lobe (Fig. 68 ). The dorsal sculpture is shiny and with dual punctation in most specimens. No specimens of Desmopachria bisulcata display iridescence. In some specimens of both males and females the dorsum is matte, with a microreticulation that obscures the punctation. Other species with similar male median lobe shapes are Desmopachria iridis and Desmopachria anastomosis , but specimens of each of these are dorsally iridescent, whereas those of Desmopachria bisulcata are not.

Description.

Measurements. TL = 2.0-2.1 mm, GW = 1.4-1.5 mm, PW = 1.0-1.1 mm, HW = 0.7-0.8 mm, EW = 0.4-0.5 mm, TL/GW = 1.4, HW/EW = 1.9-2.0. Body very broad, laterally rounded, lateral margins continuous between pronotum and elytron; dorsoventrally compressed.

Coloration. Head and pronotum evenly orange-red, same coloration. Elytron evenly brownish orange, not iridescent. Ventral surfaces evenly orange-red.

Sculpture and structure. Head broad, short; anterior margin of clypeus finely margined with continuous flattened narrow bead; surface of head shiny, but matte; eyes large (HW/EW = 1.9-2.0); 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, broadly curved with continuous narrow bead; surface matte to shiny, but punctation very fine, of the same size and evenly distributed, posterior margin sinuate. Elytron broad, laterally broadly curved; surface matte or, less commonly, shiny; punctation very fine, of the same size and evenly distributed across most of elytron, when punctate, dual with a few minute, interspersed punctures laterally. Prosternum extremely short, longitudinally compressed, medially slightly 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 matte, finely and irregularly punctate laterally; metaventrite wings extremely slender. Metacoxa with medial portion short, <1/3 length of metaventrite medially, metacoxal lines sinuate, divergent anteriorly; lateral portion of metacoxa extremely large, anteriorly strongly expanded; surface matte, finely, evenly punctate, not iridescent. Metatrochanter very 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 lateral aspect slender, evenly curved on both ventral and dorsal margins to narrowly pointed apex (Fig. 66 ); in ventral aspect very broad basally, evenly narrowed to broadly rounded apex (Fig. 67 ). Lateral lobe small, slender, apically slender, and slightly hooked dorsally with dense margin of long setae (Fig. 68 ).

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. Males tend to be both shinier and more punctate than females with are matte and not punctate in the few specimens examined.

Variation. Some specimens are matte between punctures on elytra. This does not seem correlated with sex, males and females may both be either shiny or matte. Extent of punctation seems somewhat variable among the sexes.

Etymology.

This species is named Desmopachria bisulcata , Latin for the male forked prosternal process.

Distribution.

This species is known from one locality in Sipaliwini District, Suriname (Fig. 81 ).

Type material.

Holotype in NZCS, male labeled, "SURINAME: Sipaliwini District 02°22.259'N, 56°41.227'W, 229m Camp 3; Werehpai, SE Kwamala detrital pools in dense forest 3-5.ix.2010;leg. Short & Kadosoe CI-rap Survey; SR10-0903-02A/ SEMC0912211 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria bisulcata Miller, 2021 [red label with black line border]." Paratypes, 15 in NZCS, MSBA, and SEMC labeled same as holotype except with different specimen barcode labels (Table 1 ) and each with “… PARATYPE Desmopachria bisulcata Miller, 2021 [blue label with black line border]."

Figures

Figure 81. Desmopachria species distributions, Desmopachria portmanni-aldessa species group, Desmopachria portmanni-portmanni species group, and Desmopachria striola species group.

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.