Rhabdostyla similis (Stokes 1889) nov. comb.

— Fig. 4, I’

Opisthostyla similis Stokes, 1889: 481, pl. 10, fig. 9

Diagnosis: Size about 22.5 µm. Sub-vasiform body, somewhat mutable in the posterior part. Twice as long as wide, somewhat bumpy, slightly contracted below the peristomial collar. Peduncle slightly longer than the body, distal end slightly curved. Strongly cross-striated pellicle. Posterior region contains two rounded transverse rings, the anterior being the largest, the posterior end often apparently joined to the peduncle by means of a disc-shaped appendix. Peristomial collar revolute. Peristomial disc slightly and obliquely elevated. Found in freshwater lakes, on the roots of floating plants.

Remarks: diagnosis according to Stokes (1889). According to him, the body when contracted is obovate, slightly invaginating the end of the peduncle.