Okapa, Mineo & Caleca, 1996

Perkins, Philip D., 2011, New species (130) of the hyperdiverse aquatic beetle genus Hydraena Kugelann from Papua New Guinea, and a preliminary analysis of areas of endemism (Coleoptera: Hydraenidae) 2944, Zootaxa 2944 (1), pp. 1-417 : 73

Okapa group

Only one unusual species, H. okapa , is included in this group. This is a moderately sized, darkly colored species with sexually dimorphic legs ( Figs. 119 , 324–327 ). The aedeagus ( Fig. 121 ) stands alone; also, the female tergite X, gonocoxite, and spermatheca ( Fig. 401 ) differ in shape and setal patterns from those of other groups. Hydraena okapa is currently known only from the type locality near Okapa, in eastern Area 1; elevation 1372 m ( Fig. 483 ). Microhabitats given in locality data are "ex. dead leaves caught among rocks in small swift river; gravel banks of small swift river"; and "on wet rocks above waterline in small swift river."

Figures

FIGURE 119. Hydraena okapa, holotype, dorsal and lateral habitus, and venter.

FIGURES 322–327. Scanning electron micrographs of H. phainops (322–323) and H. okapa (324–327).

FIGURES 120–121. Aedeagi of holotypes. 120. H. idema. 121. H. okapa.

FIGURES 400–403. Female tergite X, gonocoxite, and spermatheca of Hydraena species.

FIGURES 483–486. Geographical distributions of Hydraena species.