Family THIGMOPHRYIDAE Chatton & Lwoff, 1926

Syns.

Cochliodomidae, Conchophyllidae, Myxophyllidae

Body laterally flattened, uniformly and heavily ciliated; thigmotactic ciliature, on anterior left surface of body, very dense; buccal cavity at or near posterior pole, with reduced and inconspicuous buccal ciliature; symbionts in mantle cavity (or occasionally the slime) of terrestrial (pulmonate) and especially marine (generally bivalve) molluscs, with one species endocommensal in nemertine worm living in bivalve mantle cavity.

[Some workers would place this family in the following suborder.]

Cochliodomus Raabe, 1971. Single species.
Cochliophilus Kozloff, 1945. Few species.
Conchophyllum Raabe, 1936. Single species.
Myxophyllum Raabe, 1934. Single species.
Thigmophrya Chatton & Lwoff, 1923. Several species.