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单词 plesiomorphy
释义
ple·si·o·mor·phy (plēsē-ə-môrfē, plēzē-)
n. pl. ple·si·o·mor·phies
An evolved character or trait that is shared by some or all members of a phylogenetic group and their common ancestor but is not unique to that group. A segmented spinal column is a plesiomorphy of mammals, being present as well in other groups such as fishes, reptiles, amphibians, and birds.

[Greek plēsios, near to; see pel-5 in the Appendix of Indo-European roots + -MORPHY.]

plesi·o·morphic adj.
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