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A POSSIBLE ANHANGUERAN PTEROSAUR MANDIBLE FROM THE LOWER CRETACEOUS OF GERMANY P. Abel1, J. J. Hornung2, B. P. Kear3, S. Sachs4* 1Senckenberg Centre for Human Evolution and Palaeoenvironment, University of Tübigen, 72076 Tübingen, Germany 2Landesmuseum Hannover, 30169 Hannover, Germany 3Museum of Evolution, Uppsale University, 753 26 Uppsala, Sweden 4Abteilung Geowissenschaften, Naturkundemuseum Bielefeld, 33602 Bielefeld, Germany *presenting author, [email protected] Key words: Pterosauria, Anhangueria, Cretaceous, Valanginian Presentation type: poster Cretaceous pterosaur fossils are rare in Germany. The specimens documented to date are limited to only a few fragmentary body fossils and footprint traces from different Lower Cretaceous strata. Here we add to this sparse, but palaeobiogeographically significant record with the description of an incomplete mandible from marine sediments of the lower Valanginian Stadthagen Formation of Sachsenhagen in northern Germany. The remains are represented by the posterior section of a gracile symphyseal rostrum with a delicate midline ridge along its ventral edge. A pronounced lateral longitudinal groove also extends below the alveolar rim. Broken tooth crowns are preserved in the mesiodistally elongate alveoli, which are widely spaced (increasingly so posteriorly) and labially inclined without raised rims. Although precise generic affinities are uncertain, the shape and arrangement of the alveoli are reminiscent of Camposipterus nasutus Seeley 1869, from the Albian of England (which was defined on the basis of an incomplete cranial rostrum), as well as mandibles of the putative anhangueran taxon Cearadactylus atrox Leonardi & Borgomanero 1985, together with the unequivocal anhanguerids Anhanguera piscator Kellner & Tomida 2000, Tropeognathus mesembrinus Wellnhofer 1987, and Ludodactylus sibbicki Frey et al. 2003, (all of which additionally share the presence of a symphyseal ridge). We therefore conclude that the Stadthagen Formation pterosaur potentially constitutes one of the stratigraphically earliest occurrences of Anhangueria, and is at present the only known exemplar of this recovered from Germany. 7 Program and abstracts XVII Conference of the EAVP – Brussels, Belgium 2 – 6 July 2019 .

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Is Our Understanding of Santana Group Pterosaur Diversity Biased by Poor Biological and Stratigraphic Control?
Anhanguera taxonomy revisited: is our understanding of Santana Group pterosaur diversity biased by poor biological and stratigraphic control? Felipe L. Pinheiro1 and Taissa Rodrigues2 1 Laboratório de Paleobiologia, Universidade Federal do Pampa, São Gabriel, RS, Brazil 2 Departamento de Ciências Biológicas, Universidade Federal do Espírito Santo, Vitória, ES, Brazil ABSTRACT Background. Anhanguerids comprise an important clade of pterosaurs, mostly known from dozens of three-dimensionally preserved specimens recovered from the Lower Cretaceous Romualdo Formation (northeastern Brazil). They are remarkably diverse in this sedimentary unit, with eight named species, six of them belonging to the genus Anhanguera. However, such diversity is likely overestimated, as these species have been historically diagnosed based on subtle differences, mainly based on the shape and position of the cranial crest. In spite of that, recently discovered pterosaur taxa represented by large numbers of individuals, including juveniles and adults, as well as presumed males and females, have crests of sizes and shapes that are either ontogenetically variable or sexually dimorphic. Methods. We describe in detail the skull of one of the most complete specimens referred to Anhanguera, AMNH 22555, and use it as a case study to review the diversity of anhanguerids from the Romualdo Formation. In order to accomplish that, a geometric morphometric analysis was performed to assess size-dependent characters with respect to the premaxillary crest in the 12 most complete skulls bearing crests that are referred in, or related to, this clade, almost all of them analyzed first hand. Results. Geometric morphometric regression of shape on centroid size was highly Submitted 4 January 2017 statistically significant (p D 0:0091) and showed that allometry accounts for 25.7% Accepted 8 April 2017 Published 4 May 2017 of total shape variation between skulls of different centroid sizes.
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7.2.1. Introduction
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