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Re: Ankylosaurian systematics



On Sun, 23 Apr 2000, Joe Parish wrote:

> Also does the reference to the term "polacanthid" mean that there is a
> family "Polacanthidae" within the Ankylosauria, or is this meant to be
> "polacanthine"?

When it was recognized that traditional Nodosauridae was paraphyletic,
some members (including _Polacanthus_) were removed and placed closer to
_Ankylosaurus_, _Shamosaurus_, et al. In some classifications this is
named Polacanthidae, in others Polacanthinae (inside Ankylosauridae,
sister group to Shamosaurinae + Ankylosaurinae). The phylogeny in either
scheme is the same.

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