Taxon classification Animalia Coleoptera Dytiscidae

Bidessonotus ploterus Young, 1990 Figs 25, 31

Bidessonotus ploterus Young, 1990; Nilsson 2016: 99.

Diagnosis.

Specimens are relatively evenly brownish on the elytra with poorly-developed maculae. The prosternal process is lanceolate and slightly sulcate. This is a relatively small species (1.3-1.7 mm). The apical blade of the male median lobe is narrow with a relatively well developed anteroventral rounded prominence and the dorsal margin of the blade broadly truncate with a moderately distinctive medial tooth on the proximal margin (Fig. 25a,d). The right lateral lobe has the apical segment elongate, as long as the basal segment, with a prominent lobe on the ventral surface (Fig. 25b). The apical segment of the left lateral lobe is shorter and broader, apically obliquely truncate and apically expanded (Fig. 25c).

Discussion .

Young (1990) regarded this species as similar to Bidessonotus obtusatus .

Distribution.

This species is known from Brazil (Mato Grosso) (Fig. 31, Young 1990). No additional specimens were examined for this project.