Desmopachria lata, 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 lata sp. nov.

Figures 31-33 , 78

Type locality.

Brazil, Pará State, Cachimbo.

Diagnosis.

Males of this species have the median lobe short and simple (Fig. 32 ). The lateral lobes are broad, long, and apically broadly expanded and truncate in dorsal aspect (Fig. 32 ) and medially abruptly bent and apically sinuate with a narrowly rounded apex (Fig. 33 ). The genitalia are similar to Desmopachria bolivari Miller, but that species has the apices of the lateral lobes broadened and with a distinctive medially directed tooth or hook, among other more subtle genitalic shape differences ( Miller 1999: fig. 4).

Description.

Measurements. TL = 2.3 mm, GW = 1.5-1.6 mm, PW = 1.2-1.3 mm, HW = 0.8 mm, EW = 0.4 mm, TL/GW = 1.4-1.5, HW/EW = 2.1-2.2. Body very broad, rounded, laterally broadly curved, lateral margins continuous between pronotum and elytron, body broadest across elytra near midlength of body (Fig. 31 ).

Coloration (Fig. 31 ). Dorsal surface of head, pronotum and elytron dark red-brown, slightly but distinctly paler laterally on pronotum. Head appendages, pro- and mesothoracic legs, and prothoracic ventral surfaces red-orange, other ventral surfaces and metathoracic legs dark red-brown.

Sculpture and structure. Head broad, anterior margin flattened, margined with distinctive narrow bead; surface of head shiny, finely and sparsely punctate; eyes large (Fig. 31 , 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 very short, lateral margins short, slightly curved with continuous narrow bead, slightly wider medially; surface shiny, impunctate medially, finely punctate around margins. Elytron very broad, laterally broadly curved; surface shiny, more coarsely and evenly punctate than pronotum, punctation distinctive and prominent, moderately fine. Prosternum extremely short, longitudinally compressed, medially slightly carinate; prosternal process slender anteriorly, with distinctive, small medial tubercle, apically short and moderately broad, medially evenly convex, apically broadly 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 indistinct, slightly divergent anteriorly; lateral portion of metacoxa extremely large, anteriorly strongly expanded; surface shiny, evenly, finely 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 lateral aspect short, slightly curved, apically simple; in ventral aspect short, slender, parallel-sided to narrowly rounded apex (Fig. 32 ). Lateral lobe in ventral aspect evenly broad throughout much of length, apex broadly expanded laterally, apex broad, somewhat obliquely truncate (Fig. 32 ); in lateral aspect slender throughout length, abruptly curved medially, apex abruptly slightly expanded and apically narrowly rounded (Fig. 33 ).

Sexual dimorphism. No obvious sexual dimorphic features were discovered.

Variation. There is some variation in the dorsal coloration with some specimens paler than others, but otherwise, little variation exists.

Etymology.

This species is named Desmopachria lata , Latin for broad, for the broad body in this species.

Distribution.

This species is known only from the type locality, Brazil, Pará State, Cachimbo (Fig. 78 ).

Type material.

Holotype in USNM, male labeled, "Cachimbo, Para, Brasil, X.1959 M.Alvarenga/ USNMENT01190957 [barcode label]/ HOLOTYPE Desmopachria lata Miller, 2021 [red label with black line border]." Paratypes, 21 in USNM and MSBA labeled same as holotype except with different barcode labels (Table 1 ) and each with “/… PARATYPE Desmopachria lata Miller, 2021 [blue label with black line border."

Checklist of Desmopachria bifurcita species group

Desmopachria bifasciata Zimmermann, 1921 - Brazil (Figs 34 , 35 )

Desmopachria bifurcita sp. nov. - Peru

Desmopachria bolivari Miller, 1999 - Bolivia (Figs 36-38 )

Desmopachria lata sp. nov. - Brazil

Desmopachria ovalis Sharp, 1882 - Brazil (Fig. 39 )

Desmopachria varians Wehncke, 1877 - Brazil (Figs 40-42 ) (Braga and Ferreira-Jr. 2018)

Figures

Figure 78. Desmopachria species distributions. Desmopachria bifurcita species group and Desmopachria convexa species group.

Figures 28 - 45. Desmopachria species. (28 - 30) Desmopachria bifurcita 28 habitus 29 male median and lateral lobes, dorsal aspect 30 male lateral lobe, right lateral aspect (31 - 33) Desmopachria lata 31 habitus 32 male genitalia, ventral aspect 33 right lateral lobe, right lateral aspect. (34, 35) Desompachria bifasciata 34 habitus 35 male genitalia, ventral aspect (36 - 38) Desmopachria bolivari 36 male genitalia, dorsal aspect 37 right lateral lobe, right lateral aspect 38 median lobe, right lateral aspect 39 Desmopachria ovalis, male genitalia, dorsal aspect (40 - 42) Desmopachria varians 40 habitus 41 male genitalia, ventral aspect 42 right lateral lobe, right lateral aspect (43 - 45) Desmopachria pseudocavia 43 habitus 44 abdominal sternite VI, ventral aspect 45 male median lobe and right lateral lobe, ventral aspect. Scale bars: 1.0 mm for habitus drawings; 0.25 mm (44).