sphenacodontian

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English[edit]

Noun[edit]

sphenacodontian (plural sphenacodontians)

  1. (zoology) Any synapsid of the clade Sphenacodontia.
    • 2005, Thomas Stainforth Kemp, The Origin and Evolution of Mammals, page 26:
      The keel of the angular does have the deep form characteristic of the group, but it is not reflected laterally as occurs in other sphenacodontians.
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