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Tropeognathus specimen as largest Gondwana pterosaur (free pdf)



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.