Hydraena umbolenta

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 : 53

Umbolenta Complex

Three species comprise the Umbolenta Complex: H. umbolenta , H. kellymilleri , and H. loripes ( Figs. 108–110 ). These are small species (ca. 1.23–1.32 mm), which have a pronotum with a distinct dark fascia, coarse dorsal punctation, lack a pronotal scintilla, and have very small plaques. The dorsal habitus is somewhat similar to that of H. concepcionica ( Fig. 119 ) in the Steineri Complex, but the pronotum has a fascia, the metaventral plaques are smaller, and the male genitalia are very different in basic form. The male genitalia in this complex are very distinctive, short and wide, with the parameres originating on the ventral face of the main piece, the left paramere much longer than the right, and the gonopore is located at the end of a long tube-shaped process that extends well beyond the other parts of the distal piece ( Figs. 111–113). The currently known species are from Paraguay ( H. umbolenta ), and Venezuela ( H. kellymilleri , and H. loripes ).

Figures

FIGURE 108. Hydraena umbolenta, holotype, dorsal and lateral habitus, and venter.

FIGURE 109. Hydraena kellymilleri, holotype, dorsal and lateral habitus, and venter.

FIGURE 110. Hydraena loripes, holotype, dorsal and lateral habitus, and venter.

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