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Examples

  • It retains some features present in extinct Cretaceous birds that are lacking in modern birds e.g., it has non-heterocoelous presacral vertebrae, but in general has many derived features.

    A comment on the Gansus find - The Panda's Thumb 2006

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  • Heterocoelous applies to vertebrae having saddle-shaped articular facets (surfaces)

    December 6, 2011