plesiomorphyn.

Brit.

/ˈpliːzɪəmɔːfi/, U.S.

/ˈplisiəˌmɔrfi/

Origin: Formed within English, by compounding. Etymons: plesio- comb. form, -morphy comb. form.

Etymology: < plesio- comb. form + -morphy comb. form, after plesiomorphic adj. (see sense 2 at that entry), plesiomorphous adj. (see sense 2 at that entry). W. Hennig Grundzüge einer Theorie der phylogenetischen Systematik (1950) does not appear to use a corresponding German noun.

Taxonomy.

The state of being plesiomorphic (plesiomorphic adj. 2); ancestral or primitive condition as compared to a later, derived character state. Also (as a count noun): an ancestral or plesiomorphic feature or trait.

ΚΠ

1969 Systematic Zool. 18 138 It should be clear enough that my argument..dealt solely with the recognition of plesiomorphy and convergence.

1981 Paleobiology 7 137 In assigning species to positions on trees, the authors allow use of relative plesiomorphy.

1995 C. Nielsen Animal Evol. xliii. 331 The deuterostomes are originally monociliate, a plesiomorphy shared with the cnidarians.

2002 S. J. Gould Struct. Evolutionary Theory x. 1161 I would also urge my colleagues not to focus..on cladistic attempts to place all Cambrian forms at least into the stem regions of major phyla..—a strategy that leads researchers to ignore the autapomorphies of these peculiar taxa, and to coax other features into plesiomorphy with modern taxa.

This is a new entry (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	plesiomorphy
释义	plesiomorphyn. Brit. /ˈpliːzɪəmɔːfi/, U.S. /ˈplisiəˌmɔrfi/ Origin: Formed within English, by compounding. Etymons: plesio- comb. form, -morphy comb. form. Etymology: < plesio- comb. form + -morphy comb. form, after plesiomorphic adj. (see sense 2 at that entry), plesiomorphous adj. (see sense 2 at that entry). W. Hennig Grundzüge einer Theorie der phylogenetischen Systematik (1950) does not appear to use a corresponding German noun. Taxonomy. The state of being plesiomorphic (plesiomorphic adj. 2); ancestral or primitive condition as compared to a later, derived character state. Also (as a count noun): an ancestral or plesiomorphic feature or trait. ΚΠ 1969 Systematic Zool. 18 138 It should be clear enough that my argument..dealt solely with the recognition of plesiomorphy and convergence. 1981 Paleobiology 7 137 In assigning species to positions on trees, the authors allow use of relative plesiomorphy. 1995 C. Nielsen Animal Evol. xliii. 331 The deuterostomes are originally monociliate, a plesiomorphy shared with the cnidarians. 2002 S. J. Gould Struct. Evolutionary Theory x. 1161 I would also urge my colleagues not to focus..on cladistic attempts to place all Cambrian forms at least into the stem regions of major phyla..—a strategy that leads researchers to ignore the autapomorphies of these peculiar taxa, and to coax other features into plesiomorphy with modern taxa. This is a new entry (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1969
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