Euromycter. Below is the first cladogram of caseids published by Maddin et al. in 2008. Another phylogenetic analysis carried out in 2012 by Benson includes the genus Trichasaurus which occupies an intermediate position between Casea broilii and “Casea” rutena. Ennatosaurus is identified as the sister group of a clade including Angelosaurus and the three species of Cotylorhynchus. Within the latter genus, Cotylorhynchus romeri is the sister group of the two species C. hancocki and C. bransoni. Below is the cladogram of Caseasauria published by Benson in 2012. In 2015, Marco Romano and Umberto Nicosia published the first cladistic study including almost all Caseidae (with the exception of Alierasaurus ronchii from Sardinia, then considered too fragmentary). This study again resolves the genus Casea as paraphyletic, with the species “Casea” nicholsi representing a distinct unnamed genus. In their most parsimonious analysis, Ruthenosaurus is closely related to Cotylorhynchus hancocki. Ennatosaurus occupies a higher position than in previous analyses, and is identified as more closely related to Angelosaurus dolani. However, the close relationship between A. dolani and Ennatosaurus may be biaised by the extreme incompleteness of the material from the North American species. Below is the cladogram of caseids published by Romano and Nicosia in 2015. A phylogenetic analysis published in 2016 by Neil Brocklehurst and colleagues includes for the first time the genera Callibrachion and Datheosaurus which are identified as basal caseids occupying an intermediate position between Eocasea and Oromycter. Below is the phylogenetic analysis published by Neil Brocklehurst and colleagues in 2016. In 2017 Romano and colleagues published the first phylogenetic analysis including the genus Alierasaurus. The latter is recovered as the sister taxon of the genus Cotylorhynchus. Below is the phylogenetic analysis published by Romano and colleagues in 2017. In describing the species Martensius bromackerensis in 2020, Berman and colleagues published two cladograms in which Martensius is identified as one of the most basal caseids, and is positioned just above the Late Carboniferous Eocasea martini. In the first cladogram, the position of the remaining caseids is poorly resolved. In the second cladogram, Casea broilii is positioned above Martensius bromackerensis, and is followed by a polytomy between Oromycter dolesorum, Trichasaurus texensis, and a clade of remaining caseid. Within these remaining taxa, a sequence of branching taxa begins with Casea nicholsi, followed by Euromycter rutenus, then Ennatosaurus tecton, then Angelosaurus romeri, then an apical clade of the three Cotylorhynchus species plus Alierasaurus ronchii.