Limnebius kavango, Perkins, Philip D., 2015

Perkins, Philip D., 2015, Taxonomy of the water beetle genus Limnebius Leach in southern Africa (Coleoptera: Hydraenidae), Zootaxa 3948 (1), pp. 41-59 : 51-54

Limnebius kavango , new species

Figs. 9 (habitus), 20 (aedeagus), 32 (map)

Type material. Holotype (male): Namibia: Kavango : Mahango Game Reserve, 18° 17' S, 21° 43' E, 28 ii 1992, M. Uhlig ( ZMHB). Paratypes (3): Namibia: East Caprivi: Katima Mulilo, lux, 17° 29' S, 24° 17' E, 3–8 iii 1992, M. Uhlig (2 ZMHB); Kavango : Mahango Game Reserve, 18° 17' S, 21° 43' E, 28 ii 1992, M. Uhlig (1 ZMHB).

Differential diagnosis. Habitus as illustrated ( Fig. 9 ); a small species with body form markedly drop-shaped, apically distinctly acuminate, pronotal disc non-microreticulate, elytra weakly microreticulate. The aedeagus ( Fig. 20) is long and slender; distal 1/3 distinctly arcuate in ventral view, this area slightly widened and internally with the capsule; entire main piece arcuate in lateral view; apex with small, subrectangular process at the base of which is the gonopore; sparse setae apically, as illustrated. The aedeagus shows some similarity with that of L. probus , but distinctly differs in curvatures and shape of the apex.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 0.84/0.50; pronotum 0.19/ 0.50; elytra 0.59/0.50; approximate height, lateral view 0.34. Dorsum dark brown to piceous. Body form distinctly drop-shaped, apically distinctly acuminate, side margin indented slightly where pronotum joins elytra. Pronotum with disc shining, non-microreticulate, very sparsely finely punctulate, each puncture with very short adpressed seta; area posterior to eye (side view) with few distinctly larger punctures, each puncture with adpressed seta, longer than setae on disc. Elytra very weakly microreticulate, almost obsolete, with punctures and setae similar to those on pronotum. Males with first three pro- and mesotarsal segments slightly enlarged, with adhesive setae. Labroclypeal suture arcuate in frontal view in both sexes. Labrum simple. Elytral apices slightly more truncate in males than in females.

Etymology. Named in reference to the geographical distribution. Distribution. Currently known from one locality each in the Kavango area and Caprivi strip of Namibia ( Fig. 32 ).

Figures

FIGURES 9 – 11. Dorsal and lateral habitus views of holotypes.

FIGURES 32 – 34. Geographical distributions.