ornithoscelida definition

  • noun-plural:
    • a small grouping of extinct Reptilia, advanced in construction (especially for the pelvis) between reptiles and wild birds.
  • others:
    • A remarkable order of extinct reptiles providing numerous characters intermediate between those of Reptilia and Aves, the ornithic customization becoming specially well-marked when you look at the pelvic arch and limb, whence the name.
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