Desmopachria irregulara, 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 irregulara sp. nov.

Figures 69-71 , 81

Type locality.

Venezuela, Zulia State, Perija National Park, Tukuko, Río Manantial, 9°50.490'N, 72°49.310'W.

Diagnosis.

This species is distinctive for the non-iridescent dorsal and ventral surfaces and the characteristic male median and lateral lobes. The median lobe has an extremely large lobe on the dorsal surface of the median lobe medially (Fig. 69 ). The lateral lobe is broad throughout with a short, dense series of setae along the apical and subapical dorsal margins and a cluster of elongate setae subapically on the ventral margin (Fig. 71 ). The elytral punctation is large with few minute punctures interspersed. The pronotal punctation is extremely fine except posteromedially where it is large and dense.

Description.

Measurements. TL = 2.1-2.2 mm, GW = 1.4-1.5 mm, PW = 1.1-1.2 mm, HW = 0.7-0.8 mm, EW = 0.4 mm, TL/GW = 1.4-1.5, HW/EW = 1.8-1.9. Body very broad, laterally rounded, lateral margins continuous between pronotum and elytron; dorsoventrally compressed.

Coloration. Head and pronotum evenly orange-red. Elytron evenly orange-red, similar to pronotum and head, not iridescent. Metaventrites, metacoxae and abdominal ventrites orange-red, other surfaces orange.

Sculpture and structure. Head broad, short; anterior margin of clypeus finely margined with continuous flattened narrow bead; surface of head shiny, impunctate medially, finely punctate posteriorly; eyes large (HW/EW = 1.8-1.9); 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, shallowly curved with continuous narrow bead; surface shiny, punctation very fine and sparse over most of surface, punctation large and dense posteromedially, posterior margin sinuate. Elytron broad, laterally broadly curved; surface shiny, punctation dual, mostly large, relatively dense, with fewer fine punctures interspersed. 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 shiny, impunctate; 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 shiny, very finely punctate, not iridescent. Metatrochanter very large, subequal to length of ventral margin of metafemur; male metafemur curved ventrally with conspicuous series of short setae long entire margin. Abdomen with surfaces shiny and smooth, finely punctate.

Male genitalia. Male median lobe in lateral aspect irregular, ventral margin abruptly expanded submedially, evenly convexly curved in apical 2/5, ventral margin with large, apically subtruncate lobe medially, apex slight broadened, apex subtruncate (Fig. 69 ); in ventral aspect slender, lateral margins shallowly sinuate, apex deeply bifid, lateral rami apically broad, directed slightly mesad (Fig. 70 ). Lateral lobe very broad throughout length, slightly curved dorsad, apex broadly rounded, subapically on ventral surface with small cluster of elongate setae, apex and subapically on dorsal margin with dense series of short setae (Fig. 71 ).

Sexual dimorphism. Only males were examined, but male pro- and mesotarsomeres I-III appear to be slightly more broadly expanded and with ventral adhesive setae, and male prosternal process is different as in all Desmopachria portmanni group species.

Variation. There is little variation between the two male specimens examined.

Etymology.

This species is named Desmopachria irregulara , Latin for irregular, for the unusual shape of the male median lobe.

Distribution.

This species is known from one locality in Zulia State, Venezuela (Fig. 81 ).

Type material.

Holotype in MIZA, male labeled, "VENEZUELA: Zulia State 9°50.490'N, 72°49.310'W, Perija, Nat. Park: Tukuko: Río Manatial 29.i.2009; Short, García, Camacho VZ09-0129-01B: detrital pool/ SM0845453 KUNHM-ENT [barcode label]/ HOLOTYPE Desmopachria irregulara Miller, 2021 [red label with black line border]." Paratypes, 1 in SEMC labeled same as holotype except with “…SM08454561… [barcode label]" and with “… PARATYPE Desmopachria irregulara Miller, 2021 [blue label with black line border]."

Checklist of Desmopachria portmanni-portmanni subgroup - includes the non-iridescent Desmopachria with forked male prosternal process (= Desmopachria ( Portmannia ) Young, 1980)

Desmopachria basicollis Guignot, 1950 - Costa Rica

Desmopachria bisulcata sp. nov. - Suriname

Desmopachria bryanstoni Clark, 1862 - Mexico, Panama, Guatemala

= Desmopachria polita Sharp, 1882

Desmopachria carranca Braga & Ferreira-Jr., 2018 - Brazil

Desmopachria decorosa Young, 1995 - Mexico

Desmopachria dicrophalica Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria dispar Sharp, 1882 - Mexico

Desmopachria disticta Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria duodentata Braga & Ferreira-Jr., 2011 - Brazil

Desmopachria goias Young, 1995 - Brazil

Desmopachria grammosticta Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria grandinigra Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria irregulara sp. nov. - Venezuela

Desmopachria itamontensis Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria laevis Sharp, 1882 - Brazil (Braga and Ferreira-Jr. 2014)

Desmopachria mutata Sharp, 1882 - Brazil

nomen novum for Desmopachria bryanstoni Sharp, 1882

Desmopachria niger Zimmermann, 1923 - Brazil ( São Paulo

Desmopachria nigricoxa Braga & Ferreira-Jr., 2018 - Brazil

Desmopachria nigrisphera Braga & Ferreira-Jr., 2018 - Brazil

Desmopachria nitidissima Zimmermann, 1928 - Brazil

Desmopachria pittieri Young 1995 - Costa Rica

Desmopachria portmanni Clark, 1862 - USA and N Mexico

Desmopachria sobrina Young, 1995 - Panama

Desmopachria specula Sharp, 1887 - Panama (probably not part of Desmopachria portmanni species group according to Young (1995)).

Desmopachria ukuki Braga & Ferreira-Jr., 2014 - Brazil

Desmopachria undulatosterna Braga & Ferreira-Jr., 2011 - Brazil

Desmopachria variegata Sharp, 1882 - Mexico, El Salvador, Honduras

Desmopachria youngi Miller, 1999 - Bolivia

Desmopachria zetha Young, 1995 - Mexico

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.