Abstract

Since 1914, Youngina has formed the basis of our concept of the Eosuchia, the basal stalk from which all later diapsid reptiles probably evolved. Recent examination of the type specimen has revealed the presence of accessory intervertebral articulations. This derived character suggests close relationship between Youngina and the Tangasauridae, but also suggests that Youngina is too specialized to be an ancestral morphotype for other eosuchians, eolacertilians, or archosaurs.

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