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Ornithostoma, valid taxon of azhdarchoid pterosaur (free pdf)



From: Ben Creisler
bcreisler@gmail.com


A new paper not yet mentioned in the DML. The pdf is free.


A.O. Averianov (2012)
ORNITHOSTOMA SEDGWICKI – VALID TAXON OF AZHDARCHOID PTEROSAURS.
Proceedings of the Zoological Institute RAS  316(1): 40–49
http://www.zin.ru/journals/trudyzin/doc/vol_316_1/TZ_316_1_Averyanov.pdf


Ornithostoma sedgwicki Seeley, 1891 from the Lower Cretaceous (Albian)
Cambridge Greensand of England is represented by edentulous jaw
fragments, posterior skull fragment with the supraoccipital crest, and
by several postcranial bones attributed previously to Lonchodectes.
Ornithostoma is referred to the Azhdarchoidea based on a combination
of derived characters (teeth absent, middle cervicals moderately
elongated, pneumatic foramen on anterior side of humerus, large
pneumatic foramen on posterior side of femur at greater trochanter)
and plesiomorphic characters (deltopectoral crest not warped, femoral
neck to shaft angle less than 145°). The structure of the
supraoccipital crest and humerus resembles those in Tapejara, but
Ornithostoma differs from that taxon by a strong median ridge on the
occiput presumably associated with a more elongated rostrum. At least
three taxa of basal azhdarchoids were present in the British Lower
Cretaceous.