Rhabdostyla tubificis Nenninger 1948

— Fig. 4, P’

Diagnosis: Size about 60 µm. Vessel-like body, that gradually decreases towards the peduncle. Extremely short peduncle with adhesive disc. Clearly striated pellicle. Peristomial collar moderately thick. Peristomial disc slightly arcuate and bifurcated. Contractile vacuole lies below the peristomial collar. Broad, horseshoe-shaped macronucleus, positioned transversely in the middle of the body, rarely longitudinally. Found over annelids of genus Tubifex, only in the head region.

Remarks: diagnosis according to Nenninger (1948).