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Re: Differences between *Vancleavea* and thalattosaurs

 thecodont dentition - also in Miodentosaurus Askeptosaurus

The tooth implantation of *M.* is difficult to tell from the figures (and not mentioned in the text), but the figures are most easily compatible with the plesiomorphy, that is, subthecodont tooth implantation -- tooth roots the shape of a sphere segment fit into pits on the bone that have the same shape. Thecodonty means the alveoli have vertical walls over part of their depth; often it's defined as "root longer than crown" (and of course separate alveoli, unlike the aulacodont condition).

 interdental plates -- also in Miodentosaurus Askeptosaurus

Can't see any in *M.*.