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Family PSEUDOCOHNILEMBIDAE Evans & Thompson, 1964
Syn. Anophryidae

Body small, elongate-pyriform, with sparse somatic ciliature and single caudal cilium; buccal area long and shallow, provided with two distinctive "membranes" on right (two membranelles in tandem plus the paroral); practically all marine (including brackish and halophilic habitats), free-living forms or scavengers, with occasional species inquilinic in echinoids; but fresh-water and coprozoic strains known in one species.

Pseudocohnilembus Evans &'Thompson, 1964.
Several spp.

Incertae sedis:
Anophrys Cohn, 1866.
Single bonafide species
(A. sarcophaga, a marine scavenger),
in my opinion;
the crab-blood form described is a Paranophrys?