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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
| Term | Definition |
| XENOMORPHISM | Special SCULPTURE at the UMBO region of the unattached valve resembling the configuration of the substratum onto which the attached valve is or was originally fixed. Known in the Anomiidae, Gryphaeidae, Ostreidae and other PLEUROTHETIC and cemented families. It is on the right valve in oysters and on the left valves in Anomia. Erroneously called ALLOMORPHISM by some authors. See pp. 98-99 of: Stenzel, H.B., et. al., 1957. | |
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