Hydraena delvasi

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 : 50

Delvasi Complex

Two species comprise the Delvasi Complex: H. delvasi Delgado & Collantes 1996 , and H. stellula ( Figs. 96 , 97 ). These are small to medium sized species (ca. 1.23–1.42 mm), which have the pronotum with a more or less distinct dark fascia or macula. The species differ somewhat in dorsal habitus, and are considered to be related because of the aedeagal form: the distal part of the aedeagus has 3–4 lobes, the dorsal surface of the main piece has spinose projections, and the parameres are very short, originating on the ventral face of the main piece, near the distal part of the aedeagus. The currently known species are from Colombia and Venezuela ( H. delvasi ), and Ecuador ( H. stellula ).

Figures

FIGURE 96. Hydraena delvasi, holotype, dorsal and lateral habitus, and venter.

FIGURE 97. Hydraena stellula, holotype, dorsal and lateral habitus, and venter.