Acanthotrochus

Danielssen & Koren, 1879

3 species

Tentacles 12. Calcareous deposits consist exclusively of wheels, but these are of two perfectly distinct kinds. The smaller have 11 spokes and 22 more large inwardly directed teeth, as in Myriotrochus, while the larger have usually 8-10 pairs of spokes and alternating with them, 8 outwardly projecting spines. (Clark, 1907)