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Koumpiodontosuchus, new bernissartiid crocodyliform from Isle of Wight



From: Ben Creisler
bcreisler@gmail.com


A new paper in Acta Palaeontologica Polonica:


Steven C. Sweetman, Ulysse Pedreira-Segade, and Steven Vidovic (2014)
A new bernissartiid crocodyliform from the Lower Cretaceous Wessex
Formation (Wealden Group, Barremian) of the Isle of Wight, southern
England.
Acta Palaeontologica Polonica (in press)
doi: http://dx.doi.org/10.4202/app.00038.2013
http://app.pan.pl/article/item/app000382013.html


A substantially complete skull of a small crocodyliform recently found
on the foreshore near Yaverland on the south-east coast of the Isle of
Wight, southern England is described. The locality, mode of
preservation and associated matrix indicate that it is derived from
one of the plant debris beds of the Lower Cretaceous Wessex Formation
(Barremian, Wealden Group). The dentition, unique among
crocodyliforms, serves to confirm that the specimen is referable to
the, until now, monotypic family Bernissartiidae Dollo, 1883.
Apomorphies, including placement of the choana and disposition of
cranial sutures demonstrate that the Isle of Wight skull cannot be
referred to Bernissartia fagesii Dollo, 1883, known from
contemporaneous strata. Furthermore, these characters indicate that
the specimen should not be referred to a new species of Bernissartia.
Uniquely among non-eusuchian neosuchian crocodyliforms, the choana
appears to be bounded entirely by the pterygoids, although occupying
an extreme anterior position within them. The specimen is therefore
placed in a new genus and species, Koumpiodontosuchus aprosdokiti. The
systematic position of Bernissartiidae, and characters used to
diagnose Eusuchia are discussed.