Hydraena cochabamba, Perkins, Philip D., 2011

Perkins, Philip D., 2011, New records and description of fifty-four new species of aquatic beetles in the genus Hydraena Kugelann from South America (Coleoptera: Hydraenidae), Zootaxa 3074, pp. 1-198 : 62-63

Hydraena cochabamba , new species

Figs. 130 (habitus), 132 (aedeagus), 200 (map)

Type Material. Holotype (male): Bolivia: Cochabamba , Cochabamba , 105 km E Yungas, nr. Rio Carmen Mayu ( Cochabamba - Villa Tunari Rd.), ex. flight intercept trap, elev. 1750 m, 17° 8' S, 65° 43' W, 1–6 ii 1999, R. Hanley ( BOL 1H99 024). Deposited in the SEMC. Paratype: Same data as holotype (1 SEMC).

Differential Diagnosis. A broad, darkly colored species with rather uniform punctation on the frons. Similar in dorsal habitus to H. manabica ( Figs. 127 , 130 ), and like that species the mesoventral intercoxal process is very narrow, and the metaventrite lacks plaques; differentiated therefrom by the smaller size (ca. 1.44 mm vs. 1.59 mm), the more elongate elytra (L/W ca. 1.39 vs. 1.27), and the differently shaped pronotum, which is less transverse, and has a greater difference in the PA and PB measurements. The male genitalia of the two species distinctively differ ( Figs. 129, 132). Also, the male protibiae differ in the two species, while showing some basic plan similarities.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.59/0.71; head 0.30/0.39; pronotum 0.40/0.56, PA 0.42, PB 0.49; elytra 0.99/0.71. Dorsum of head piceous; pronotum dark brown to piceous, darkest on disc; elytra dark brown; legs brown; maxillary palpi testaceous, tip not darker. Body form broad.

Frons punctures near eyes ca. 1xef, not appreciably smaller, slightly sparser medially; interstices shining, ca. 1xpd laterally, 1–3xpd medially. Clypeus microreticulate laterally, very finely sparsely punctulate medially. Mentum and postmentum very sparsely very finely punctulate, shining. Genae raised, shining, without posterior ridge.

Pronotum arcuate laterally; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc ca. 2–3xpd largest punctures on frons, interstices shining, 2–4xpd medially, punctures larger and denser at anterior, posterior and laterally; PF1, PF2 and PF4 absent; PF3 moderately deep.

Elytra moderately arcuate laterally; summit of posterior declivity before midlength; lateral explanate margins moderately wide; on basal 1/3 punctures slightly smaller than largest pronotal punctures, punctures becoming finer and more widely spaced toward posterior. Intervals not raised, shining, on basal 1/3 ca. 2–3xpd, as are interstices between punctures of a row, a few punctures subserial. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming shallow angle with one another.

Plaques absent. P1 laminate; median carina sinuate in profile. P2 very narrow, l/w ca. 5/1, sides slightly diverging toward blunt apex, apex raised slightly above mesoventral intercoxal process. Metaventrite with gradually sloping median depression, and very small point on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 5x P2. Protibia very slightly arcuate, medial margin distinctively produced and bearing short setae at ca. distal 3/4. Meso- and metatibia slender, straight. Male abdominal apex symmetrical; last tergite with apicomedian notch. Female (microslide mount, n=1): last tergite broadly rounded, with rather deep apicomedian notch, ca. 15 wide, very slightly hooked setae set back from margin, apicomedian gap very small; gonocoxite not midlongitudinally divided, apical margin sharply rounded, low transverse ridge evident at border of microreticulation; spermatheca type C1.

Etymology. Named in reference to the type locality.

Distribution. Currently known only from the type locality ( Fig. 200).

Figures

FIGURE 127. Hydraena manabica, holotype, dorsal and lateral habitus, and venter.

FIGURE 130. Hydraena cochabamba, holotype, dorsal and lateral habitus, and venter.