Hydraena scintillamima, 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 : 28-29

Hydraena scintillamima , new species

Figs. 35 (habitus), 37 (aedeagus), 185 (spermatheca), 195 (map)

Type Material. Holotype (male): Peru : Cajamarca, Celendin area, 6° 52' S, 78° 8' W, 25 v – 11 vi 1936, F. Woytkowski. Deposited in the SEMC. Paratypes: Same data as holotype (13 SEMC).

Differential Diagnosis. Similar in dorsal habitus to H. scintillarca and H. tridigita ( Figs. 35–36 , 45 ); refer to the diagnoses of those species. The male genitalia indicate a relationship to H. scintillarca ( Figs. 37, 38).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.71/0.72; head 0.25/0.41; pronotum 0.40/0.56, PA 0.42, PB 0.52; elytra 1.08/0.72. Dorsum brown to dark brown, head and disc of pronotum darkest; legs brown; maxillary palpi testaceous, tip not darker.

Frons punctures ca. 1xef, larger and denser near eyes than medially; interstices laterally microreticulate, dull, ca. 1xpd, medially shining, ca. 1–5xpd. Clypeus microreticulate laterally, very finely sparsely punctulate medially. Mentum microreticulate and very sparsely very finely punctulate, weakly shining; postmentum very finely densely micropunctulate and dull in median concavity, surrounding areas smooth, shining. Genae raised, shining, without posterior ridge.

Pronotum weakly arcuate laterally; anterior margin straight behind eyes, emarginate behind frons except slightly produced at distinct scintilla; punctures on disc much larger and deeper than those on frons, interstices weakly shining, 1–3xpd on disc, punctures larger and denser at anterior and posterior, sparser above and to sides of PF2; PF1 shallow; PF2 moderately deep; PF3 very deep; PF4 shallow; PF3 and PF4 broadly confluent.

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

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1.5/6/4. P1 laminate; median carina sinuate in profile. P2 l/w ca. 2/1, sides straight, apex blunt, raised slightly above mesoventral intercoxal process. Plaques narrow, straight, tapering anteriorly, converging toward one another anteriorly, weakly raised posteriorly, located at sides of deep median depression. Metaventrite without processes extending from posterior margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 2x P2. Profemur (male) with small, sharply pointed tubercle next to trochanter. Protibia straight, gradually and slightly increasing in width from base to subapically, then narrowed. Meso- and metatibia slender, straight. Male abdominal apex asymmetrical; last tergite with marginal notch, oblique and offset to left side. Female (microslide mount, n=1): last tergite broadly rounded, with rather deep apicomedian notch, setae hair-like, not hooked, in row on each side, median gap moderately wide; 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 close similarity in dorsal habitus to H. scintillarca .

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

Figures

FIGURE 35. Hydraena scintillamima, holotype, dorsal and lateral habitus, and venter.

FIGURE 36. Hydraena scintillarca, holotype, dorsal and lateral habitus, and venter.

FIGURE 45. Hydraena tridigita, holotype, dorsal and lateral habitus, and venter.

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