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单词 plesiomorphy
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plesiomorphy


ple·si·o·mor·phy

P5404650 (plē′sē-ə-môr′fē, plē′zē-)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- in Indo-European roots + -morphy.]
ple′si·o·mor′phic adj.

EncyclopediaSeecladistics

plesiomorphy


plesiomorphy

(plē′sē-ə-môr′fē, plē′zē-)n. pl. plesiomor·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.
ple′si·o·mor′phic adj.
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