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Re: Kellner revises Pteranodon: new genera
Dawndraco? Named after Dawn French? Surely not after Aurora....
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On 2010-12-16, at 12:24 PM, "Thomas R. Holtz, Jr." <email@example.com> wrote:
> KELLNER, Alexander W.A.. Comments on the Pteranodontidae (Pterosauria,
> Pterodactyloidea) with the description of two new species.
> An. Acad. Bras. CiÃnc. [online]. 2010, vol.82, n.4, pp. 1063-1084. ISSN
> 0001-3765. doi: 10.1590/S0001-37652010000400025.
> Considered one of the best known flying reptiles, Pteranodon has been subject
> to several reviews in the last century. Found
> exclusively in the Upper Cretaceous Niobrara Formation and Pierre Shale Group
> 11 species have been attributed to this genus
> (excluding the ones presently regarded as representing Nyctosaurus). While
> reviewers agree that this number is inflated, there is
> disagreement on how many species can be identified. The last review
> recognized only two species (Pteranodon longiceps and Pteranodon
> sternbergi) both being sexually dimorphic. Based on several cranial features,
> some specimens previously referred to the genus
> Pteranodon are re-evaluated leading to the recognition of the following
> species, two of which new that are described here:
> Pteranodon longiceps, Geosternbergia sternbergi, Geosternbergia maiseyi sp.
> nov., and Dawndraco kanzai gen. et sp. nov. They differ
> mainly by features such as the direction and extension of the frontal crest,
> the angle and extension of the posterior process of the
> premaxillae, the shape and extension of the lower temporal fenestra and the
> length and proportion of the rostrum. The procedures to
> recognize a pterosaur species are also discussed here, and must take into
> account primarily morphology, in conjunction with
> stratigraphic and geographic data. Although well aware that changes in
> morphology not always reflect taxonomy, the lack of
> stratigraphic data and the limited number of specimens that can be
> confidently assigned to one species hampers our understanding on
> the morphological variations as a function of ontogeny, individual variation
> and sexual dimorphism. Although the present study has
> not eliminated the possibility to recognize such differences, caution is
> needed before models are generalized for pterosaurs.
> Pdf at:
> PS, a request: if this thread morphs into a discussion on etymology, PLEASE
> change the subject line!!
> Thomas R. Holtz, Jr.
> Email: firstname.lastname@example.org Phone: 301-405-4084
> Office: Centreville 1216
> Senior Lecturer, Vertebrate Paleontology
> Dept. of Geology, University of Maryland
> Fax: 301-314-9661
> Faculty Director, Science & Global Change Program, College Park Scholars
> Fax: 301-314-9843
> Mailing Address: Thomas R. Holtz, Jr.
> Department of Geology
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