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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Atrochus

Atrochus Wierzejski, 1893

ref. ID; 1663

Body spindle-shaped, foot absent. Corona with numerous small peripheral tentacles. Single species. (ref. ID; 1663)

ref. ID; 1923

Corona with short, horny process on dorsal side. Foot reduced to a hemispheric projection at the posterior end. (ref. ID; 1923)
  1. Atrochus tentaculatus Wierzejski, 1893 (ref. ID; 1345, 1663, 1923, 2809, 3688, 7846)

Atrochus tentaculatus Wierzejski, 1893 (ref. ID; 1345, 1663, 1923, 2809, 3688, 7846)

Descriptions

This species is lying on bottom or on plants. (ref. ID; 1923)

The head was contracted and the epidermis strongly annulated. The corona was only evident in the embryo which already presented well developed unci. Two subtaneous eggs were located above the embryo. In the mastax of the female the trophi elements, rami and unci were clearly visible. The cellular stomach, located near the mastax, is follows by a tube-shaped intestine. The trophi consists of two clasp-shaped rami, a reduced manubrium, a short fulcrum, and a symmetrical pair of unci each bearing a single tooth. In apical view the unci tooth is a lancet-shaped rod. (ref. ID; 2809)

Measurements

Total length of living specimens vary from 1080-1420 µm (Koste 1978), contracted specimens measured 655 µm in length. (ref. ID; 2809)