Uteriporidae with a thick circular muscle layer around the bursal canal, the latter usually being lined with an infranucleated epithelium. Unicellular glands may be present, discharging their secretion into the bursal canal.
This subfamily contains the following genera: Obrimoposthia Sluys and Ball, 1989, Nesion Hyman, 1956, Tryssosoma Ball, 1977, Paucumara Sluys, 1989a, Ectoplana Kaburaki, 1917, Ostenocula Sluys, 1989a Procerodella Sluys, 1989a, Miroplana Kato, 1931.