| Cryptochilidium Schouteden, 1906 (syn. Symbionecta). Single species [not to be confused with Cryptochilum!] . |
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| Entodiscus Madsen, 1931. Few species. |
 |
| Pectensia Jankowski, 1973. Single species. |
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| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family ENTODISCIDAE Jankowski, 1973
| possible syn. | Gullmarellidae |
Body of medium size, ovoid, dorsoventrally compréssed, with small caudal projection bearing single bristle; buccal ciliature inconspicuous, located anteriorly on ventral surface; inquilines of sea urchins (Entodiscus), commensals in bivalve molluscs (Pectenita), or in esophagus of sipunculids (Cryptochilidium).
| Cryptochilidium Schouteden, 1906 (syn. Symbionecta). Single species [not to be confused with Cryptochilum!] . |
|
| Entodiscus Madsen, 1931. Few species. |
|
| Pectensia Jankowski, 1973. Single species. |
|