Reference

Kuidong Xu, Weibo Song (1998): Morphological studies on a commensal ciliate, Pseudocyclidium longum nov. spec. (Ciliophora, Scuticociliatida) of the mantle cavity of marine mollusc Cyclina sinensis (Gmelin, 1791) from the coast of the Yellow Sea – Yellow Sea – 4: 1 - 4.