[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

New Pterosaur Paper, Yay!

Martill, David M. and Darren Naish (2006)Cranial Crest
Development in the Azhdarchoid Pterosaur Tupuxuara,
With a Review of the Genus and Tapejarid Monophyly.


A portion of pterosaur skull from the Romualdo Member
of the Santana Formation (?Albian-?Turonian,
Cretaceous) of north-east Brazil provides new data on
the morphology and ontogeny of azhdarchoid pterosaur
cranial crests. The specimen consists of parts of the
cranial bones posterodorsal to the nasoantorbital
fenestra, including partial nasals, lacrimals,
frontals and possibly the parietals. A posterodorsally
directed premaxillary crest with a concave posterior
border is located dorsal to the posterior border of
the nasoantorbital fenestra. A well-defined suture
indicates overlapping, posterodorsally directed growth
of the premaxilla over the skull roof, suggesting that
the generation of the premaxillary crest is a late
ontogenetic feature and thus probably related to
sexual display. The systematics of Tupuxuara and its
relationship to other azhdarchoids is reviewed and a
cladistic analysis of the group is presented.
Tupuxuara is found to be the sister-taxon to
Azhdarchidae. Tupuxuara longicristatus Kellner and
Campos, 1988 is argued to be the only valid named
species in this genus and Thalassodromeus Kellner and
Campos, 2002 is considered a junior subjective synonym
of this taxon. As originally conceived, Tapejaridae is
paraphyletic: a new, more restrictive version of
Tapejaridae (including Tapejara and Sinopterus dongi)
might exist, but its monophyly is weakly supported.
Furthermore, Tapejara was found to be paraphyletic in
all trees.


Christopher Collinson

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around