Genus: Elongate, flattened; flexible, ribbon-like; anterior end neck-like and tip truncate; cytopharynx narrow,
with trichocysts; two macronuclei; contractile terminal (Kudo, 1966).
Apex a low dome, not ventrally bent; body much flattened (Illustrated Guide, 1985).
Neck is truncated transversely and carries a short snout-like tip (Carey, 1992).
Images of collecting locality:
No.2, Iyari marsh, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii