Relating to or characteristic of the Cotylosauria group of extinct reptiles with socket-like hips.
From Cotylosauria (the group name) + -ian (suffix meaning 'of or relating to'), directly describing features of this prehistoric reptile group.
The '-ian' suffix is super common in science for turning a group name into an adjective, so 'cotylosaurian' features means 'features typical of cotylosaurus'—it's like saying 'Shakespearean' to mean 'like Shakespeare's style.'
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