Hydraena cordispina, 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 : 23-24

Hydraena cordispina , new species

Figs. 22 (habitus), 159 (spermatheca), 194 (map)

Type Material. Holotype (female): Peru : Madre de Dios, Parque Manu, Pakitza, Trocha Dos, c.53, berlesed leaf litter, elev. 250 m, 12° 7' S, 70° 58' W, 16 ix 1989, R. A. Faitoute (42A). Deposited in the USNM. Paratypes: Same data as holotype (19 USNM).

Differential Diagnosis. Differentiated from all other species of American Hydraena , except H. multispina , by the spinose elytral apices and spinose labrum ( Figs. 21–22 ). Refer to the diagnosis of H. multispina for comparisons of the two species.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.40/0.55; head 0.28/0.31; pronotum 0.34/0.42, PA 0.34, PB 0.29; elytra 0.77/0.55. Dorsum of head with frons piceous, clypeus and labrum reddish brown, pronotum and elytra dark reddish brown; legs reddish brown; maxillary palpi testaceous, tip not darker.

Eyes small. Frons microreticulate and coarsely punctate near eyes, dull; medially finely punctate, ca. 1xef, interstices shining, ca. 1–2xpd. Clypeus microreticulate laterally, effacedly microreticulate and very finely sparsely punctulate medially. Labrum with median incision deep, anterior margin of each lobe straight, except lateral angle produced in sharp point. Mentum very sparsely very finely punctulate, weakly shining; postmentum densely punctulate. Genae weakly raised, shining, carinate laterally, without posterior ridge.

Pronotum strongly cordiform, much narrower at base than at midlength, posterior angles slightly obtuse; anterior margin straight behind eyes, weakly emarginate behind frons, scintilla absent; punctures on disc much larger and deeper than those medially on frons, interstices shining, 0.5–2xpd, punctures larger and denser at anterior and posterior; PF1 shallow; PF2 absent; PF3 moderately deep; PF4 very shallow; area between PF3 and lateral margin wide, convex, microreticulate and dull.

Elytra moderately convex, summit of posterior declivity at ca. posterior 1/3; lateral explanate margins becoming very wide behind midlength; lateral margin in posterior 1/6 with spinose processes, ca. 10 on each side, becoming gradually larger toward posterior; five series of punctures between suture and humeral umbo; on basal 1/2 punctures ca. 2xpd largest pronotal punctures, punctures becoming much finer and much more widely spaced toward posterior. Intervals not raised, shining, on basal 1/2 ca. 1–2xpd, as are interstices between punctures of a row. Apices in dorsal aspect rather sharply conjointly rounded, in posterior aspect margins do not form angle with one another. Brachypterous.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 4/1.5/6/5. P1 as wide as P2, concave between coxae; median carina straight in profile, present only in front of coxae. P2 raised, l/w ca. 2/1, sides converging toward rounded apex. Plaques narrow, straight or slightly arcuate, converging toward one another and joined, or nearly so, anteriorly adjacent to apex of P2, weakly raised, conjointly forming inverted V-shape, located at sides of deep median depression. Metaventrite with longitudinal ridge on each side, extended posteriorly from margin of each mesocoxal cavity. AIS and adjacent area on first ventrite conjointly forming deep concavity; AIS width at posterior margin ca. 1.5x P2. Legs simple (female; male unknown). Female (microslide mount, n=1): last tergite broadly rounded, without apicomedian notch, ca. 24 hooked, long, strong setae in contiguous row; gonocoxite divided by weakly sclerotized midlongitudinal area, apical margin broadly rounded, lacking transverse ridge; spermatheca not C-type, entrance to capsule very, if not completely, constricted ( Fig. 159). Female 5th ventrite with long setae very sparse.

Etymology. Named in reference to the cordate pronotum, and spinose labrum and elytra.

Distribution. Currently known only from the type locality ( Fig. 194 ).

Figures

FIGURE 21. Hydraena multispina, holotype, dorsal and lateral habitus, and venter.

FIGURE 22. Hydraena cordispina, holotype female, dorsal and lateral habitus, and venter.

FIGURES 193 – 194. 193. Geographical distributions of species in the Paeminosa Group. 194. Geographical distributions of species in the Curvosa and Multispina Groups.