Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Order Next family	Cylichnidae The family Cylichnidae  includes mostly burrowing species with well calcified shells. A spire is absent and they can withdraw completely into their shells. At least three species are known from Hawaii in two genera (Cylichna and Eocylichna). Cylichna analogia Cylichna biplicata Eocylichna cf. venustula
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