The genus Allodaposuchus (Crocodilomorpha, Eusuchia): from basal Eusuchia to Crocodylia

摘要: The clade of eusuchian crocodilomorphs are composed of several stem taxa, such as hylaeochampsids and the genus Allodaposuchus, and the crown Crocodylia containing the three major extant lineages (Crocodyloidea, Alligatoroidea and Gavialoidea). This clade probably originated in the northern continents (North America and Europe) at the the Early Cretaceous (Buscalioni, 2003; Puértolas-Pascual et al., 2014). The systematics of some basal eusuchians is controversial, especially due to their fragmentary nature and the lack of postcranial record for the majority of species. For instance, while some analyses place the genus Allodaposuchus and Hylaeochampsidae as a sister taxa of Crocodylia (Delfino et al., 2008; Puértolas-Pascual et al., 2013), others suggest that Allodaposuchus was related to the clade Alligatoroidea+ Crocodyloidea (Puértolas et al., 2011). Recently, new remains attributed to the genus Allodaposuchus have been discovered in the lower Tremp Formation materials from the Fumanya area (lower Maastrichtian, northeastern Iberian Peninsula). They consist of a partial skull and numerous postcranial elements belonging to both axial and appendicular skeletons. Thus, it represents the most complete postcranial material known for Allodaposuchus.Phylogenetic relationships of the genus Allodaposuchus have been explored including morphological data provided by the new specimen. Characters were codified following Brochu (2011) and analysed by maximum parsimony using TNT. Eighty-five taxa were used as ingroup, and Bernissartia fagesii as outgroup. We performed three phylogenetic analyses: 1) cranial …