Hydraena scintillapicta, 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 : 26

Hydraena scintillapicta , new species

Figs. 28 (habitus), 30 (aedeagus), 195 (map)

Type Material. Holotype (male): Suriname: Sipaliwini District, Camp 3, Wehepai; 2010 CI-RAP Survey, detrital pools forest, elev. 237 m, 2° 21.776' N, 56° 41.861' W, 3–7 ix 2010, Short & Kadosoe (SR10-0903-02A). Deposited in the SEMC.

Differential Diagnosis. Differentiated from the other members of the Costiniceps Complex by the entirely microreticulate pronotum, which has a small, distinctive, rectangular macula ( Fig. 28 ). The aedeagus is similar to that of H. buscintilla , but the two distinctively differ in many details ( Figs. 29–30).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.25/0.54; head 0.24/0.32; pronotum 0.32/0.42, PA 0.36, PB 0.39; elytra 0.73/0.54. Dorsum of head with frons dark brown to piceous, clypeus dark brown medially, light brown laterally; pronotum testaceous around small, rectangular macula, ratios of color bands, as measured in midline, ca. 6/8/6; elytra dark brown, apices lighter; legs light brown to testaceous; maxillary palpi testaceous, tip not darker.

Frons punctures ca. 1–1.5xef, not appreciably larger and denser near eyes than medially; interstices laterally microreticulate, dull, medially weakly shining, ca. 0.5–1xpd; occiput in midline with very fine, parallel transverse grooves. Clypeus microreticulate, dull, very finely sparsely punctulate. Mentum very sparsely very finely punctulate, effacedly microreticulate, dull; postmentum finely densely micropunctulate, dull. Genae raised, shining, without posterior ridge.

Pronotum weakly arcuate laterally; anterior margin straight behind eyes, emarginate behind frons, except slightly produced in midline at large, slightly concave scintilla. Pronotum entirely microreticulate, dull, except scintilla; punctures on disc larger and deeper than those of frons, some punctures slightly elongate, interstices ca. 1xpd, punctures not larger and denser at anterior and posterior; PF1, PF2 and PF 4 absent; PF3 deep.

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

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/2/6/3. P1 laminate; median carina sinuate in profile. P2 l/ w ca. 2/1, sides parallel, apex blunt, apex raised slightly above mesoventral intercoxal process. Plaques rather wide, widest posteriorly, tapering anteriorly, very slightly, if at all, arcuate, medial margins parallel; weakly raised, located at sides of moderately deep median depression. Metaventrite with very short point on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 1.5x P2. Protibia slightly arcuate, slightly widened in distal 1/2. Meso- and metatibia slender, straight. Abdominal apex very slightly asymmetrical; last tergite with small notch, slightly offset to left side.

Etymology. Named in reference to the colorful pronotum and distinctive scintilla.

Distribution. Currently known only from the type locality ( Fig. 195 ).

Figures

FIGURE 28. Hydraena scintillapicta, holotype, dorsal and lateral habitus, and venter.

FIGURE 195. Geographical distributions of Hydraena species in the Costiniceps Complex.