A new capitosaur from the Middle Triassic of Spain and the relationships within the Capitosauria
Fortuny, Josep (Institut Català de Paleontologia Miquel Crusafont)
De Santisteban, Carles (Universitat de València. Departament de Botànica i Geologia)
Galobart, Àngel (Institut Català de Paleontologia Miquel Crusafont)

Data:	2011
Resum:	Capitosaurs were the largest and homogeneous group of Triassic temnospondyl amphibians with cosmopolitan distribution. However, their interrelationships are debated. The first capitosaur cranial remains found in the Iberian Peninsula were assigned to Parotosuchus; herein, a re−description of this material, together with information on other remains recovered from the same site, enables us to classify them as a new genus: Calmasuchus acri gen. et sp. nov. (Amphibia: Temnospondyli) from the early−to−middle Anisian (early Middle Triassic). This capitosaur had a combination of plesiomorphic and non−plesiomorphic characters, such as posterolaterally directed tabular horns, paired anterior palatal vacuities, and unique morphology of the lower jaw. By cladistic analysis, we propose a new phylogeny for the monophyletic capitosaurs. In the analysis, Capitosauria is supported by seven synapomorphies. Wetlugasaurus is the most basal member of the clade. The score of the Russian taxon Vladlenosaurus alexeyevi resulted in a clade including Odenwaldia and the latter taxa. The Madagascarian Edingerella is the sister taxon of Watsonisuchus. Finally, Calmasuchus acri, the new taxon described here, appears as a more derived form than Parotosuchus. The new genus is the sister taxon of the Cyclotosaurus-Tatrasuchus and Eryosuchus-Mastodonsaurus clades.
Nota:	Ajuts: this research was supported by Synthesys (European Union−funded Integrated Activities) grant DE−TAF−5309 to JF.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Temnospondyli ; Capitosauria ; Mastodonsauroidea ; Phylogeny ; Computed tomographic scanning ; Anisian ; Triassic ; Spain
Publicat a:	Acta Palaeontologica Polonica, Vol. 56, issue 3 (2011) , p. 553-566, ISSN 1732-2421

DOI: 10.4202/app.2010.0025

18 p, 837.1 KB

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