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1 May 2017 The Gobiosuchidae in the Early Evolution of Crocodyliformes
Ángela D. Buscalioni
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Abstract

The anatomy and phylogenetic relationships of the Las Hoyas gobiosuchid (upper Barremian, La Huérguina Formation, Cuenca, Spain) are discussed on the basis of two fully articulated specimens. Phylogenetic analysis supports the monophyly of Gobiosuchidae, defined by the Las Hoyas taxon, Cassissuchus sanziuami, gen. et sp. nov., as the sister taxon of the Asian clade Gobiosuchus Zaraasuchus. The family Gobiosuchidae is diagnosed by a large number of synapomorphies, such as the presence of extensively sutured palpebrals, ridges on the dorsal surface of the posterolateral region of the squamosal, a longitudinal ridge along the dorsolateral surface of the surangular, appendicular osteoderms, and closure of the supratemporal fenestra. Specimens attributed to Lisboasaurus estesi, a putative gobiosuchid, are evaluated and the taxon regarded as a nomen dubium. Cassissuchus sanziuami provides new evidence on the anatomy of the pectoral and pelvic girdles and the forelimb morphology in Gobiosuchidae. The phylogeny of basal Crocodyliformes supports the nested sequence of three clades: Protosuchidae, Gobiosuchidae, and ((Shantungosuchus Sichuanosuchus) Shartegosuchidae), but their interrelationships are only partially solved. The early evolution of Crocodyliformes is further characterized by the high number of phenotypic specializations, many of which are related to the dermal skeletal overgrowth of the temporal region, palpebrals, and osteoderms.

© by the Society of Vertebrate Paleontology
Ángela D. Buscalioni "The Gobiosuchidae in the Early Evolution of Crocodyliformes," Journal of Vertebrate Paleontology 37(3), (1 May 2017). https://doi.org/10.1080/02724634.2017.1324459
Received: 1 June 2016; Accepted: 1 March 2017; Published: 1 May 2017
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