Sergentia Kieffer (Fig. 91)

Head capsule large, yellow. Antenna 5-segmented, premandible with 2–4 teeth. All mandibular teeth dull brown. One relatively short dorsal tooth and 4 inner teeth present. Mentum with 4 large, separated, equally broad and slightly elevated median teeth, central pair slightly lower than outer one, and with 6 pairs lateral teeth. Ventromental plates as wide as mentum, moderately curved and continuously striated, in S. coracina - type, however, with obvious paired striations along anterior margin.

Remarks: Sergentia is closely related to Phaenopsectra and the shape of mentum appearing as separated in three sections resembles some other genera (see remarks to Phaenopsectra). Sergentia may be recognized by the usual 4 inner mandibular teeth, 4 subequal median mental teeth, not reduced outermost lateral teeth, and paired striations conspicuous along anterior margin in S. coracina - type.

One species, Sergentia coracina (Zetterstedt, 1850), is documented from a few of the Tatra Mts. lakes, all situ-ated in sub-alpine zone (Bitušík 2004).

The morphotype recognised was found in one lake only.