Hydraena concepcionica, 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 : 58

Hydraena concepcionica , new species

Figs. 119 (habitus), 121 (aedeagus), 199 (map)

Type Material. Holotype (male): Paraguay: Dep. Concepcion, Est. San Luis, 8 ix 1997, Drechsel. Deposited in the NMW.

Differential Diagnosis. A coarsely, densely punctate species with well developed microreticulation and a distinct pronotal macula. The elytral punctures are very dense, interstices only ca. 0.5–1xpd, and each has a rather distinctive, short seta. Similar to H. steineri in coarse punctation, general body outline, and plaques ( Figs. 118–119 ); differentiated therefrom by the lighter color with distinctive pronotal macula, the deeper pronotal foveae P2, the presence of areas of less dense punctation on the pronotal disc, the less elongate elytra, and the microreticulate frons. The aedeagi of the two species, while showing some general plan similarities, differ markedly in many details ( Figs. 120–121).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.49/0.61; head 0.23/0.36; pronotum 0.35/0.48, PA 0.40, PB 0.44; elytra 0.89/0.61. Dorsum of head dark brown to piceous; pronotum light brown to testaceous in front of and behind piceous macula, ratios of color bands, as measured in midline, ca. 6/12/ 5; elytra brown; legs light brown; maxillary palpi testaceous, tip not darker.

Frons punctures ca. 0.5–1xef, slightly larger and denser near eyes than medially; interstices microreticulate, dull, 0.5xpd or less laterally, 1–2xpd medially. Clypeus microreticulate, dull, very indistinctly finely punctulate. Mentum and postmentum microreticulate, dull. Genae microreticulate, dull; medially raised slightly; laterally concave, with posterior ridge.

Pronotum weakly arcuate laterally; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc much larger and deeper than those of frons, interstices effacedly microreticulate, very weakly shining, 0.5–3xpd, punctures larger and denser at anterior and posterior; PF1 very shallow, obsolete; PF2 shallow; PF3 deep; PF4 very shallow.

Elytra weakly arcuate laterally; summit of posterior declivity at ca. midlength; lateral explanate margins narrow; punctures coarse, dense, each with rather distinctive short seta; on basal 1/3 punctures ca. 1xpd largest pronotal punctures, punctures becoming finer and more widely spaced toward posterior. Intervals not or only very weakly raised, effacedly microreticulate, dull, on basal 1/3 ca. 0.5–1xpd, as are interstices between punctures of a row, a few punctures subserial. Apices in dorsal aspect very weakly separately rounded, in posterior aspect margins forming very shallow angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1/6/4. 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 narrow, very slightly arcuate, slightly converging toward one another anteriorly, 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. 1.5x P2. All tibiae straight, slender, simple. Abdominal apex symmetrical; last tergite with very small apicomedian notch. Females not yet known.

Etymology. Named in reference to the type locality.

Distribution. Currently known only from the type locality ( Fig. 199).

Figures

FIGURE 118. Hydraena steineri, holotype, dorsal and lateral habitus, and venter.

FIGURE 119. Hydraena concepcionica, holotype, dorsal and lateral habitus, and venter.