An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
by Paul S. Mikkelsen

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Term Definition
PLESIOMORPHY   An ancestral or primitive character. See also: APOMORPHY.

See the Paleos website for greater detail.
   
SYMPLESIOMORPHY   A character shared by a number of groups, but inherited from ancestors older than the last common ancestor. See also: PLESIOMORPHY.

See the Paleos website for greater detail.
   

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