Family CRYPTOCHILIDAE Berger, n. fam.

Body moderate to large in size, heavily ciliated, commonly with caudal projection bearing one or more longer cilia; buccal organelles shifted posteriorly in some genera, but retain similariry in general morphology and morphogenesis; inquilinic in sea urchins, plus a few species in woodboring molluscs.

[Family is erected here with credit to Berger, who has been planning to describe it, but as of the date of the present publication in which the first characterization appears.]

Biggaria Kahl, 1934. Single species [echinoid host] .
Biggariella Profant [unpublished] . Single species.
Cryptochilum Maupas, 1883. Few to several species [not to be confused with Cryptochilidium!] .
Metaxystomium Berger [unpublished] . Few species.
Metoikos Berger & Thompson [unpublished] . Single species.
Tanystomium Berger [unpublished] . Single species.
Thigmozoon Santhakumari & Nair, 1973 (syn. Biggaria p.p.). Few species [molluscan host] .
Yagiua Profant [unpublished] . Single species.