Lastochkin, 1935b
Type species Stephensoniella fluviatilis Lastochkin, 1935a
Number of species 1. In NWE, one species:
Potamodrilus fluviatilis (Lastochkin, 1935a)
Description
Small transparent worms. Prostomium with ciliated ventral side. No sensory pits. Numerous colourless, unicellular adhesive glands in body wall. Both dorsal and ventral chaetal bundles consisting of hair chaetae. In mature individuals, two pairs of testes in IV and V, one pair of ovaries in V, small unpaired, ventral male pore on anterior edge of VI, and similarly unpaired ventral female pore, surrounded with crown of clitellum-like gland cells, in 6/7. The only known genus in the family, differing from the Aeolosomatidae in constant segment number, constant number and position of testes and ovaries, as well as in presence of well-developed genital ducts.
Crawling on substratum in the interstitial crevices.
Distribution
Europe.
Ecology
In freshwater.
Reproduction
Sexual.
Literature
Lastochkin, 1935a: 636-643; Lastochkin, 1935b: 488; Bunke, 1967: 336; Van der Land, 1971: 692-693; Chekanovskaya, 1981: 187; Kasprzak, 1981: 87-88.