Chun, 1889
Wings disc-shaped composed of five lobes, transparent except for a few muscle fibres. Two incisions in swimming disc border define square-shaped median part. Two wing tentacles arising between lateral lobes of wings. Visceral mass with opaque appendix curved around swimming disc. Besides median lobe, disc has two long tentacles. No proboscis. Anterior part of rounded cylindrical body large, posterior part small, only extreme end showing some coiling. Head parts curved ventrally in right angle to plane of swimming disc. Integument with small reddish gland cells. Glandular, ciliated fold at posterior body pole. Buccal appendages lacking, tentacles small with rudimentary eyes. Body length 2.0 mm, diameter of swimming disc 4 mm.