A new crocodylomorph specimen from the Araripe Basin (Crato Member,Santana Formation), northeastern Brazil |
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Authors: | Rodrigo G Figueiredo Alexander W A Kellner |
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Institution: | 1.Paleovertebrate Sector, Department of Geology and Paleontology,Museu Nacional/Universidade Federal do Rio de Janeiro,S?o Cristóv?o,Brazil |
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Abstract: | The fossil fauna of the Santana Formation (Early Cretaceous) comprises many distinct taxa, but crocodylomorphs are poorly
understood. Here we describe a new specimen (MPSC-R1137) that consists of a complete hind limb found in the Crato Member,
the basal section of the Santana Formation. Based on the characteristics of the fibula (e.g., pronounced variation of the
shaft width) and length proportions of the femur and tibia, this specimen can be distinguished from Caririsuchus camposi and Araripesuchus gomesii, which are known from the Romualdo Member (the upper lithostratigraphic unit of the Santana Formation). The only crocodylomorph
formally described from the Crato Member is Susisuchus anatoceps, whose holotype lacks elements of the hind limb. On the basis of a comparative anatomical study of the hind limb, which shows
no similarities between MPSC-R1137 and other crocodylomorphs from the Araripe Basin, we tentatively classify this new specimen
as cf. Susisuchus sp., and provide new anatomical information for this rather derived crocodylomorph.
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Keywords: | Crato Member Crocodylomorph Early Cretaceous Neosuchia Postcranial remains Santana Formation |
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