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Re: Tropeognathus specimen as largest Gondwana pterosaur (free pdf)



From: Ben Creisler
bcreisler@gmail.com

A number of news stories about the discovery:

http://phys.org/news/2013-03-huge-fossilized-reptile-rio.html

in Portuguese:
http://www.ebc.com.br/tecnologia/2013/03/fosseis-de-pterossauro-esperam-dez-anos-para-serem-exibidos-no-museu-nacional

in French:
http://www.lemonde.fr/sciences/article/2013/03/20/le-squelette-d-un-pterosaure-geant-presente-a-rio_1851268_1650684.html


On Wed, Mar 20, 2013 at 1:34 PM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
>
>
> A new paper not yet mentioned on the DML. The pdf is open access.
>
> KELLNER, ALEXANDER W. A.; CAMPOS, DIOGENES A.; SAYÃO, JULIANA M.;
> SARAIVA, ANTÔNIO A.F.; RODRIGUES, TAISSA; OLIVEIRA, GUSTAVO; CRUZ,
> LILIAN A.; COSTA, FABIANA R.; SILVA, HELDER P.; FERREIRA, JENNYFER S.
> (2013)
> The largest flying reptile from Gondwana: a new specimen of
> Tropeognathus cf. T. mesembrinus Wellnhofer, 1987 (Pterodactyloidea,
> Anhangueridae) and other large pterosaurs from the Romualdo Formation,
> Lower Cretaceous, Brazil.
> Anais da Academia Brasileira de Ciências 85(1): 113-135
> ISSN 0001-3765.
> http://dx.doi.org/10.1590/S0001-37652013000100009.
>
> A very large pterosaur (MN 6594-V) from the Romualdo Formation
> (Aptian/Albian), Santana Group, Araripe Basin, is described. The
> specimen is referred to Tropeognathus cf. T. mesembrinus mainly due to
> the presence of a low and blunt frontoparietal crest, the
> comparatively low number of teeth and the inclined dorsal part of the
> occipital region. Two distinct wingspan measurements for pterosaurs
> are introduced: the maximized wingspan (maxws), which essentially
> consists of doubling the addition of all wing elements and the length
> of the scapula or the coracoid (the smaller of the two), and the
> normal wingspan (nws), which applies a reducing factor (rfc) to the
> maximized wingspan to account for the natural flexures of the wing.
> The rfc suggested for pteranodontoids is 5%. In the case of MN 6594-V,
> the maxws and nws are 8.70 m and 8.26 m, respectively, making it the
> largest pterosaur recovered from Gondwana so far. The distal end of a
> larger humerus (MCT 1838-R) and a partial wing (MPSC R 1395) are also
> described showing that large to giant flying reptiles formed a
> significant part of the pterosaur fauna from the Romualdo Formation.
> Lastly, some comments on the nomenclatural stability of the Santana
> deposits are presented.