Hydraena fasciola, 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 : 39

Hydraena fasciola , new species

Figs. 62 (habitus), 65 (aedeagus), 170 (spermatheca), 200 (map)

Type Material. Holotype (male): Ecuador: Pastaza Province, oil production platform "Villano B", pool in forest stream, elev. 400 m, 1° 27' S, 77° 29' W, 24 v 2008, A. Short (AS-08-009C). Deposited in the SEMC. Paratypes: Same data as holotype (6 SEMC).

Differential Diagnosis. Dorsal habitus ( Fig. 62 ) similar to the other species that have a testaceous pronotum: H. mauriciogarciai , H. pedroaguilerai , H. limpidicollis , and H. newtoni ( Figs. 63 , 67–69 ). Differentiated from H. mauriciogarciai and H. limpidicollis by the presence of a testaceous elytra fascia ( H. mauriciogarciai has a macula, while the elytra are dark brown in H. limpidicollis ). H. newtoni can be differentiated from the compared species by the deep triangular impression of the metaventrite. The aedeagus of H. fasciola shows some resemblance to that of H. mauriciogarciai , but they markedly differ in many details ( Figs. 65, 66). The spermatheca bears some resemblace to that of H. limpidicollis ( Figs. 170–171).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.01/0.43; head 0.16/0.27; pronotum 0.26/0.34, PA 0.30, PB 0.30; elytra 0.60/0.43. Dorsum of head piceous; pronotum testaceous; elytra dark brown with diffusely margined testaceous fascia just posterior to summit of posterior declivity, and narrowly bordered with testaceous at apices; legs testaceous; maxillary palpi testaceous, tip not darker.

Frons very finely sparsely punctate, punctures near eyes slightly larger and denser, ca. 1–2xef, than punctures medially; interstices shining, ca. 1xpd laterally, 2–7xpd medially. Clypeus microreticulate laterally, 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; very finely sparsely punctate, punctures on disc ca. 1xpd those medially on frons, interstices strongly shining, 3–9xpd, punctures larger and denser at anterior and posterior; PF1, PF2 and PF4 absent; PF3 shallow.

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 finer and more widely spaced toward posterior. Intervals not raised, strongly shining, on basal 1/3 ca. 2–4xpd, 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. 2/1/4/3. P1 laminate; median carina sinuate in profile. P2 relatively short, l/w ca. 3/2, sides slightly converging toward blunt apex, apex raised slightly above mesoventral intercoxal process. Plaques narrow and indistinct, straight, slightly converging toward one another anteriorly, not raised, located at sides of deep median depression. Metaventrite with very short longitudinal ridge on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 1.5x P2. Protibia slightly arcuate, slender, widest at ca. distal 1/3. Meso- and metatibia slender, straight. Male abdominal apex symmetrical; last tergite with apicomedian notch. Female (microslide mount, n=1): last tergite broadly rounded, setae long, hair-like, not hooked; gonocoxite not midlongitudinally divided, apical margin sharply rounded, no transverse ridge evident at border of microreticulation; spermatheca C-type, but highly modified, with a sclerotized process on both capsule and accessory gland cup ( Fig. 170).

Etymology. Named in reference to the dorsal bands of color and the small body size of this species.

Distribution. Currently known only from the type locality ( Fig. 200).

Figures

FIGURE 62. Hydraena fasciola, holotype, dorsal and lateral habitus, and venter.

FIGURE 63. Hydraena mauriciogarciai, holotype, dorsal and lateral habitus, and venter.

FIGURE 67. Hydraena pedroaguilerai, holotype, dorsal and lateral habitus, and venter.

FIGURE 68. Hydraena shorti, holotype, dorsal and lateral habitus, and venter.

FIGURE 69. Hydraena limpidicollis, non-type from Venezuela, dorsal and lateral habitus, and venter.