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Re: New Doswellia species from Upper Triassic of New Mexico
Doswellia sixmilensis is a new species of the doswelliid
> archosauromorph genus Doswellia named for an incomplete skeleton
> from the Upper Triassic Bluewater Creek Formation of the Chinle Group
> in west-central New Mexico, USA. D. sixmilensis differs from D.
> kaltenbachi Weems, the type and only other known species of
> Doswellia, in its larger size, higher tooth count and greater
> heterodonty, possession of keels on the cervical centra and the
> presence of discrete knobs or spikes on some osteoderms.
And none of this is ontogenetic...?