Hydraena neoaccurata, Perkins, 2014

PERKINS, PHILIP D., 2014, A revision of the water beetle genus Hydraena Kugelann for southern Africa (Coleoptera: Hydraenidae), Zootaxa 3758 (1), pp. 1-92 : 56-58

Hydraena neoaccurata , new species

Figs. 39 (habitus), 41 (aedeagus), 77 (map)

Type material. Holotype (male): South Africa: Mpumalanga Province, Nelshoogte gallery forest below St., shore washing, 25° 51' S, 30° 53' E, 2 xii 1986, Endrödy-Younga (#2343) ( TMSA) . Paratypes (179): South Africa: Mpumalanga Province, Same data as holotype (177 TMSA); Same data as holotype, except river stones (2 TMSA) .

Differential diagnosis. Refer to the diagnosis of H. accurata .

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.60/0.66; head 0.25/0.40; pronotum 0.38/0.50, PA 0.42, PB 0.44; elytra 0.98/0.66. Dorsum of head dark brown to piceous; pronotum brown around dark brown macula; elytra brown; legs brown; maxillary palpi testaceous.

Frons punctures ca. 2xef, larger and denser near eyes than medially; interstices weakly shining, 0.5–1xpd laterally, 1–3xpd medially. Clypeus mcr laterally, very finely sparsely punctulate medially. Mentum moderately densely finely punctulate, interstices shining; postmentum contiguously punctulate. Genae raised, weakly shining, without posterior ridge.

Pronotum laterally slightly emarginate behind middle; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc much larger and deeper than those of frons, interstices shining, 1–2xpd, punctures slightly larger at posterior; PF1 absent; PF2 very shallow; PF3 moderately deep; PF4 very shallow or obsolete.

Elytra weakly arcuate laterally; summit of posterior declivity at ca. midlength; lateral explanate margin moderately wide; on basal 1/3 punctures slightly smaller than largest pronotal punctures, punctures becoming finer and more widely spaced toward posterior. Intervals not raised, shining, on basal 1/3 ca. 1–2xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming shallow angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1/6/5. P1 laminate; median carina sinuate in profile. P2 l/ w ca. 4/1, sides parallel, apex blunt, apex raised slightly above mesoventral intercoxal process. Plaques very narrow, parallel, weakly raised, margins not strongly demarcated, located at sides of moderately deep median depression. Metaventrite without midlongitudinal carina between intercoxal process and median depression. AIS width at slightly arcuate posterior margin ca. 2x P2. All tibiae slender, protibiae slightly arcuate, meso- and metatibiae straight. Abdominal apex symmetrical; last tergite with apicomedian notch. Female (microslide mount, n=1): last tergite moderately sharply rounded, with rather deep apicomedian notch, ca. 9 non-hooked or only very weakly hooked setae set back from margin ca. ½ length of setae, each seta widest at midlength, not quite contiguous, median gap rather wide; gonocoxite not midlongitudinally divided, apical margin moderately sharply rounded, low transverse ridge evident at border of microreticulation; spermatheca type simple C shape.

Etymology. Named in reference to the relationship to H. accurata , as evidenced by the aedeagal form.

Distribution. Currently known only from the type locality ( Fig. 77 ).

Figures

FIGURE 39. Hydraena neoaccurata, holotype, dorsal and lateral habitus.

FIGURES 77–78. Geographical distributions of Hydraena species.