Hrabe, 1936b
Description
Small unpigmented worms. Prostomium small, conical. External secondary annulation beginning from VII. Chaetae two per bundle, sigmoid with nodulus, with tiny upper tooth. Male pores on small conical protuberances in IX, spermathecal pores in X, ventral; clitellum poorly developed. Pharyngeal glands extend to VI. No blind appendages on dorsal vessel. Testes in VIII and IX, posterior vasa deferentia penetrate into X and back to IX. Atria in IX pear-shaped, covered with prostatic cells, with long duct. Penes on small porophores. Spermathecae in X, with ovoid ampulla and discrete duct. Differing from congeners in its bifid chaetae, and a forward shift of reproductive system by one segment. These characters are shared with Trichodrilus diversisetosus, but this species is characterized by simple-pointed, ventrally enlarged chaetae in the foremost segments.
Burrowing in sediment.
Distribution
Europe.
Ecology
In freshwater, rare.
Reproduction
Sexual only. Eggs laid in cocoons.
Literature
Hrabe, 1936b: 404-407, Figs 1-4; Cook, 1971a: 234, Fig. 5.13D; Kasprzak, 1981: 199, Figs 796-798.