Phylum Mollusca Linnaeus, 1758 - molluscs Class Caudofoveata Boettger, 1956 [monotypic] - caudofoveatans Order Chaetodermatida Simroth, 1893 Family Prochaetodermatidae Salvini-Plawen, 1968 Genus Prochaetoderma Thiele, 1902