Ochthebius (Aulacochthebius) perlaevis, (Perkins)

Perkins, Philip D., 2023, Taxonomic revision of African water beetles in the genus Ochthebius Leach (1815) subgenus Aulacochthebius Kuwert (1887) (Coleoptera: Hydraenidae), Zootaxa 5228 (5), pp. 501-546 : 544

O. (Aulacochthebius) perlaevis (Perkins)

Figs. 2 , 21 , 32

Aulacochthebius perlaevis Perkins 2017: 220

Differential diagnosis. Differentiated from most other members of the O. (A.) tenuipunctus Group by the combination of the small size and wide body form, and by the aedeagus. Differentiated from the similarly wide and small species O. (A.) latissimus by the very uniform serial rows of elytral punctures, and by the aedeagus. The aedeagus ( Fig. 21 ) distal tip of the main-piece is shallowly bifid; this is illustrated by Perkins (2017), but the sides of the main-piece, which are produced as points, were obscured on the specimen by the closely fitting paramere tips. The aedeagus is more completely illustrated herein ( Fig. 21 ).

Figures

FIGURE 2. Dorsal habitus of species in O. (A.) tenuipunctus Group.

FIGURE 21. O. (A.) perlaevis (Perkins), aedeagus of paratype.

FIGURES 31–32. Geographical distributions. 31. O. (A.) plicicollis Fairmaire. 32. O. (A.) perlaevis (Perkins).