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Re: The New Papers Before Christmas
Kayentachelys aprix has previously been hypothesized to be the oldest stem
cryptodiran turtle because of the presence of a flat, vertical plate on
processus pterygoideus externus, and the presence of a processus
Just these two characters?
However, the presence of these characters cannot be confirmed in the
available specimens. Other putative stem-cryptodiran characters, such as
prefrontal-vomer contact and the presence of an epipterygoid, are herein
corroborated as being symplesiomorphies, because they generally appear to
present in basal turtles.
Agnolin, F.L. 2007. Brontornis burmeisteri Moreno & Mercerat, un
Anseriformes (Aves) gigante del Mioceno Medio de Patagonia, Argentina.
Revista del Museo Argentino de Ciencias Naturales, n.s. 9(1):15-25.
What? An anseriform?!?
Thus, this test provides no support for a possible role of
ionizing radiation in the K-T extinction event.
For that, they'd need a lot of material from a very short timespan...