Family HAPTOPHRYIDAE Cépède, 1923

For	Discophryidae Cépède [non Collin] ;
Syns.	Sieboldiellinae, Sieboldiellininae

Body large, elongate (up to 2,000 µm in length, some species), densely ciliated; kineties converge anteriorly onto horseshoe-shaped suture line; conspicuous adhesive sucker at apical end of body, sometimes provided with two or more hooks or spines; long canal replaces row(s) of contractile vacuoles; anisotomic fission, with chain-formation common; hosts include marine and fresh-water turbellarians, anuran, and (especially) urodelean amphibians.

[Should this, plus the following group, be separated from all preceding astome taxa at some suprafatnilial (e.g., subordinal) level?]

Annelophrya Lom, 1959. Single species.
Cepedietta Kay, 1942 (syn. "Haptophrya", as widely misused). Several species [all in amphibian hosts, especially salamanders].
Haptophrya Stein, 1867 (for Discophrya Stein [non Lachmann] syn. Sieboldiellina). Several species [solely in turbellarian hosts].
Gachmannella Cépède, 1910. Single species.
Steinella Cépède, 1910. Single species.