Parhydraenopsis cooperi (Orchymont), 1948

Perkins, Philip D., 2009, Revisions of the genera Parhydraena Orchymont, Protozantaena Perkins, Decarthrocerus Orchymont, and Parhydraenopsis nomen novum, aquatic and humicolous beetles from Africa and Madagascar, and comparative morphology of the tribe Parhydraenini (Coleoptera: Hydraenidae), Zootaxa 2038, pp. 1-119 : 49-50

Parhydraenopsis cooperi (Orchymont), 1948 new combination

( Figs. 1, 30, 31, 78, 80, 102)

Parhydraena (Pseudhydraena) cooperi Orchymont, 1948: 721 .

Parhydraena (Decarthrocerus) cooperi: Hansen, 1998 (catalog).

Type material. Holotype (male): Ethiopia: Abyssinia , Djem-Djem forest, small stream, elev. 8,000 ft., 9° 0' N, 38° 12' E, 10.x.1926, J. Omer Cooper [labels: Abyssinia: Small stream, Djem-Djem forest, 8,000 ft. 10-X- 1926, J. Omer Cooper // Brit. Mus. 1927-127. // TYPE [red] // A. d'Orchymont det. Parhydraena cooperi m. / / Aedeagus drawn by P. D. Perkins 1991 // DIGITAL IMAGE captured 2008 P. D. Perkins]. Deposited in the BMNH . Paratype: Same data (1 female, BMNH) .

Differential diagnosis. Recognized among other members of the genus by the comparatively long maxillary palpi (palpus length/head width ca. 0.57) and legs (metatibia+metatarsus length subequal width of pronotum) ( Fig. 78). The complex aedeagus is very distinctive ( Fig. 80).

Description. Size (length/width, mm) holotype: body (length to elytral apices) 2.38/1.07; head 0.40/0.67; pronotum 0.55/0.93, PA 0.79, PB 0.77; elytra 1.49/1.07. Dorsum of head and disc of pronotum dark brown to piceous; lateral areas of pronotum, elytra, and legs brown to dark brown; maxillary palpi light brown, distal 1/ 3 of last mere slightly darker.

Head with eyes moderately large, in dorsal aspect 10 convex facets in longest series. Ocelli distinct round small shining, each located at base of shallow oblique interocular fovea. Frons coarsely, irregularly punctate, largest punctures ca. 3xef, interstices shining, varying from narrow walls to ca. 1xpd; punctures microreticulate between interocular foveae and eye. Clypeus weakly shining, more finely punctate than frons. Labrum weakly shining, rather coarsely punctate, apicomedially emarginate to form rounded lobe on each side, anterior margin narrowly upturned. Maxillary palpi moderately short, combined lengths of meres much less than width of head (ratio ca. 27/47); ratios of meres 2–4 ca. 10/5/12. Mentum and submentum finely, moderately densely punctulate, mentum shining, submentum less so, effacedly microreticulate.

Pronotum with anterior margin almost straight, median ca. 5/13 weakly emarginate and with narrow hyaline border, margin laterally to hyaline border sloping away slightly. Anterior angles obtuse, rounded. Sides rounded, widest just before middle, behind middle gradually attenuate, very weakly sinuate. Posterior angle obtusangulate. Shallow wide impression at each posterior angle, confluent laterally with shallow impression at anterior angle. Pronotal punctures markedly microreticulate, many confluent in discal U-shaped impressions, on discal relief punctures smaller and shallower, U-shaped or completely divided into two smaller punctures, interstices shining. Sculpture laterally rugose, dull, "punctures" obsolete (i.e., completely confluent), "ridges" prominent, granuliform.

Elytra weakly shining, subovate, sides arcuate, explanate margins rather wide, distinct from shoulder for ca. 6/7 of length, apices separately rounded. Ten-seriate punctate, but punctures obsolete, granule of each "puncture" large, serial granules closely spaced, very similar in size and spacing to unilinear row of granules on each interval; granules random on intervals 1–3 near base. Each granule at its posterior side with short but quite distinct recumbent seta; setae of serial and interval granules very similar in length and density, giving a very uniform appearance to elytral sculpture.

Metaventrite in male with shallow median elongate oval impression in basal 1/2, except strong, short, midlongitudinal carina in posterior 1/2 of impression, area between anterior extreme of oval impression and mesoventral intercoxal process with midlongitudinal shining carina; impression in female narrower and shallower, and lacking carina. Metaventrite and abdominal ventrites 1–4 hydrofuge pubescent. Ventrite 5, in both sexes, hydrofuge pubescent in basal ca. 1/6 laterally, shining part very sparsely pubescent. Ventrite 6 sparsely pubescent in posterior 1/2. Male: last ventrite symmetrical, free margin arcuate, small tuft of setae on each side; last tergite with tuft of setae on each side of apicomedian notch. Female: last ventrite sparsely pubescent, margin rounded; last tergite produced in small point on each side of apicomedian emargination, small tuft of setae on each side.

Legs moderately long and slender, combined lengths of metatibia and metatarsus greater than width of head (ratio ca. 65/47), ratio of lengths of metatibia/metatarsus ca. 35/30. Basal 3 pro- and mesotarsomeres, in male, with setae beneath, not forming pad of suction setae.

Wings fully developed in holotype and paratype.

Aedeagus length ca. 0.39 mm; main-piece, in ventral view, narrowing and tapering to apical point, in right lateral view bifurcate apically, with cluster of long setae on left side; distal piece very complicated, internally with vesicle, gonopore bearing flagellum forming a circle; paramere on left side very small, oval, with two setae, paramere on right side absent, but two setae present ( Fig. 80). Spermatheca as illustrated ( Fig. 30).

Distribution. Currently known only from the type locality at the Djem-Djem forest, Ethiopia ( Fig. 102).