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Witton, M. P. 2008. A new azhdarchoid pterosaur from the Crato Formation (Lower
Cretaceous, Aptian?) of Brazil. Palaeontology 51 (6): 1289-1300.
Abstract: A partial pterosaur skull from the Nova Olinda Member of the Crato
Formation (Lower Cretaceous, Aptian?) represents a new edentulous
pterodactyloid, Lacusovagus magnificens gen. et sp. nov. The absence of teeth
and a large nasoantorbital fenestra suggest assignment to Azhdarchoidea, and
the combination of a particularly short, crestless and shallow rostrum and
laterally flared jaw margins distinguish it from other azhdarchoid taxa. The
position of the new form within Azhdarchoidea is problematic: Lacusovagus is
distinguished from Tapejaridae in its straight, as opposed to ventrally
displaced, jaw tip and absence of a premaxillary crest; from thalassodromids by
the absence of a premaxillary crest; and from Azhdarchidae by the short length
of the rostrum and shallow posterodorsal extension of the premaxilla.
Lacusovagus shares a shallow, crestless rostrum and a slender posterodorsal
premaxillary extension with Jiufotang Formation azhdarchoids such as
Jidapterus. The position of these genera within Azhdarchoidea is
controversial, but the suite of plesiomorphic and derived azhdarchoid
characters in each suggests a placement between Tapejaridae and Neoazhdarchia.
Further research is required, however, to determine the relationships of these
genera both to each other and to other azhdarchoids. The new taxon elevates the
faunal similarity found between the roughly contemporaneous Jiufotang and Crato
formations and continues the pattern of Crato Formation azhdarchoids being much
larger than those from the Jehol Group. It also has jaws at least 67 and 55 per
cent longer, respectively, than those of the largest azhdarchoids and
ornithocheirids from the Crato pterosaur assemblage, making Lacusovagus the
largest pterosaur known from this unit.
Ing. Yasmani Ceballos Izquierdo <email@example.com <mailto:firstname.lastname@example.org>