Desmopachria bifurcita, 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 bifurcita sp. nov.

Figures 28-30 , 78

Type locality.

Peru, Junín, Sani Beni. The type locality is ambiguous. According to Otto (2017) this collection locality by P. Woytkowski may refer to a misspelling of "Sani Benu" which is at approximately 11.253917°S, 74.565565°W (see below).

Diagnosis.

Males of this species have the male genitalia very distinctive with the median lobe very short and strongly bifurcate (Fig. 29 ). The lateral lobes in dorsal aspect and broad, parallel-sided, and apically subtruncate (Fig. 29 ). In lateral aspect, they are slender and abruptly bent medially (Fig. 30 ). Specimens are very broad in dorsal aspect and dark reddish-brown dorsally. A number of species of Desmopachria have the median lobe short with long, medially bent lateral lobes like Desmopachria bifurcita , including Desmopachria bifasciata Zimmermann, Desmopachria bolivari Miller, Desmopachria chei Miller, Desmopachria lata sp. nov., Desmopachria varians Wehncke, and Desmopachria ovalis Sharp. Among these, Desmopachria bifurcita is the only one with a bifid median lobe (Fig. 29 ). These species may together form another species group within Desmopachria , but more thorough examination of specimens will be needed to determine this.

Description.

Measurements. TL = 1.8-1.9 mm, GW = 1.3 mm, PW = 1.0 mm, HW = 0.6 mm, EW = 0.3 mm, TL/GW = 1.4, HW/EW = 2.1-2.4. Body very broad, rounded, laterally broadly curved, lateral margins continuous between pronotum and elytron, body broadest across elytra anterior midlength of body (Fig. 28 ).

Coloration (Fig. 28 ). Dorsal surface of head dark red, paler red along anterior margin. Pronotum evenly red. Elytron red, vaguely darker along anterior and sutural margins. Head appendages, legs, and ventral surfaces red to dark red.

Sculpture and structure. Head broad, anteriorly produced in rounded lobe; anterior margin of clypeus curved, flattened, margined with conspicuous, continuous flattened narrow bead; surface of head shiny, finely and sparsely punctate; eyes large (Fig. 28 , HW/EW = 2.1-2.4); 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, punctate around margins, punctation variable, fine to course. Elytron moderately broad, laterally broadly curved; surface shiny, more coarsely and evenly punctate than pronotum, punctation distinctive and prominent. Prosternum extremely short, longitudinally compressed, medially slightly carinate; prosternal process slender anteriorly, with distinctive, small medial tubercle, apically short and broad, medially slightly carinate, concave, apically acutely pointed. Metaventrite broad and evenly smoothly convex medially, surface shiny, moderately and irregularly 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, evenly punctate, punctures evenly distributed. 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 extremely short, apically distinctly bifid, each branch apicolaterally pointed, (Fig. 29 ). Lateral lobe in ventral aspect evenly broad throughout length, lateral margins parallel, apically broadly rounded (Fig. 30 ) in lateral aspect slender throughout length, abruptly curved medially (Fig. 31 ).

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 bifurcita , Latin for the short, bifurcate male median lobe.

Distribution.

The exact locality of collection of this species is somewhat ambiguous. The locality Sani Beni is probably "Sani Benu" at coordinates 11.253917°S, 74.565565°W, as with Eucnemidae Eschscholtz specimens collected by the same collector as documented by Otto (2017) (Fig. 78 ).

Type material.

Holotype in SEMC, male labeled, "PERU Dept. Juni Sani Beni 1 Aug. 1935 ["1 Aug." handwritten] P. Wyotkowski co/ HOLOTYPE Desmopachria bifurcita Miller, 2021 [red label with black line border]." Paratypes, 5 in SEMC and MSBA labeled same as holotype except with dates, 10 Aug 1935, 11 Aug 1935, 19 Aug 1935, 20 Aug 1935, and 6 Nov 1935 and “/… PARATYPE Desmopachria bifurcita Miller, 2021 [blue label with black line border]."

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).