Hydraena loripes, 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 : 54-55

Hydraena loripes , new species

Figs. 110 (habitus), 113 (aedeagus), 202 (map)

Type Material. Holotype (male): Venezuela : Amazonas, Stream along Rio Sipapo, S. Communidad Cano Gato, various streamside habitats, elev. 87 m, 4° 55.849' N, 67° 44.645' W, 16 i 2009, Short, Garcia, Camacho, Miller, Joly (VZ09-0116- 02X). Deposited in the MIZA. Paratypes: Same data as holotype (9 SEMC).

Differential Diagnosis. Dorsal habitus very similar to H. umbolenta and H. kellymilleri ( Figs. 108–110 ). The pronotal foveae are deeper in H. loripes than in the compared species, having shallow PF2, whereas PF2 are absent in H. umbolenta . In H. loripes the elytral punctures are slightly smaller than the largest pronotal punctures, whereas in H. kellymilleri the elytral punctures are as large as the largest pronotal punctures. In addition, males of H. loripes are recognized by the markedly arcuate hind tibiae. The aedeagi of the three species, while having distinctively different details, also show a relationship ( Figs. 111–113).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.32/0.50; head 0.20/0.35; pronotum 0.31/0.41, PA 0.37, PB 0.39; elytra 0.79/0.50. Dorsum of head piceous; pronotum testaceous in front of and behind piceous fascia, ratios of color bands, as measured in midline, ca. 5/10/5, fascia laterally smaller and more lightly colored; elytra brown, columellae slightly darker than interstices; legs testaceous; maxillary palpi testaceous, tip not darker.

Frons punctures ca. 1xef, not larger and denser near eyes; interstices effacedly microreticulate, weakly shining, 1–3xpd. Clypeus dull, microreticulate, very finely sparsely punctulate medially. Mentum and postmentum very sparsely very finely punctulate, shining. Genae raised, shining, without posterior ridge.

Pronotum weakly arcuate laterally; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc larger and deeper than those on frons, interstices weakly shining, 0.5–4xpd, punctures larger and denser at anterior and posterior, sparsest in front of PF2; PF1 very shallow; PF2 shallow; PF3 deep; PF4 shallow.

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

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1.5/5/4. P1 laminate; median carina sinuate in profile. P2 l/w ca. 2/1, sides slightly converging toward blunt apex, apex raised slightly above mesoventral intercoxal process. Plaques narrow, straight, parallel, very weakly raised, located at sides of deep median depression. Metaventrite with very small point on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 2.5x P2. Protibia moderately arcuate in distal 1/2. Mesotibia slightly arcuate. Metatibia very markedly arcuate in distal 1/2, medial margin with few short setae near apex ( Fig. 110 ). Male abdominal apex symmetrical; last tergite with very small apicomedian notch. Female (microslide mount, n=1): last tergite moderately broadly rounded, free margin serrate, ca. 28 moderately long, closely spaced, some contiguous, hooked setae; gonocoxite not midlongitudinally divided, apical margin broadly rounded, no transverse ridge evident at bor- der of microreticulation; spermatheca type C1.

Etymology. Named in reference to the markedly arcuate hind tibiae ( loripes = bowlegged).

Distribution. Currently known only from the type locality ( Fig. 202).

Figures

FIGURE 108. Hydraena umbolenta, holotype, dorsal and lateral habitus, and venter.

FIGURE 109. Hydraena kellymilleri, holotype, dorsal and lateral habitus, and venter.

FIGURE 110. Hydraena loripes, holotype, dorsal and lateral habitus, and venter.