A giant caseid, Alierasaurus ronchii, gen. et sp. nov., is herein described, based on a partial postcranial skeleton collected from the Permian Cala del Vino Formation (Alghero, Nurra, northwest Sardinia). Despite the highly conservative morphology of ribs and vertebral material, typical of caseids, the very well-preserved foot elements show highly autapomorphic features, warranting assignment of the specimen to a new genus. In particular, the fourth metatarsal is not short and massive, as in other large caseids, and shows a distinct axial region. Finally, the claw-shaped ungual phalanges are autapomorphic in being proportionately very short, with a strong double ventral flexor tubercle positioned very close to the proximal phalangeal rim, and a distal end that is not spatulate, but rather subtriangular in transverse section. Principal component and reduced major axis slope analyses, performed on 10 caseid specimens, suggest that the observed changes in overall shape of metatarsal IV were mainly linked to the enormous body size reached by the Sardinian specimen.

Alierasaurus ronchii, gen. et sp. nov., a caseid from the Permian of Sardinia, Italy / Romano, Marco; Nicosia, Umberto. - In: JOURNAL OF VERTEBRATE PALEONTOLOGY. - ISSN 0272-4634. - STAMPA. - 34:4(2014), pp. 900-913. [10.1080/02724634.2014.837056]

Alierasaurus ronchii, gen. et sp. nov., a caseid from the Permian of Sardinia, Italy

ROMANO, MARCO;NICOSIA, Umberto
2014

Abstract

A giant caseid, Alierasaurus ronchii, gen. et sp. nov., is herein described, based on a partial postcranial skeleton collected from the Permian Cala del Vino Formation (Alghero, Nurra, northwest Sardinia). Despite the highly conservative morphology of ribs and vertebral material, typical of caseids, the very well-preserved foot elements show highly autapomorphic features, warranting assignment of the specimen to a new genus. In particular, the fourth metatarsal is not short and massive, as in other large caseids, and shows a distinct axial region. Finally, the claw-shaped ungual phalanges are autapomorphic in being proportionately very short, with a strong double ventral flexor tubercle positioned very close to the proximal phalangeal rim, and a distal end that is not spatulate, but rather subtriangular in transverse section. Principal component and reduced major axis slope analyses, performed on 10 caseid specimens, suggest that the observed changes in overall shape of metatarsal IV were mainly linked to the enormous body size reached by the Sardinian specimen.
2014
01 Pubblicazione su rivista::01a Articolo in rivista
Alierasaurus ronchii, gen. et sp. nov., a caseid from the Permian of Sardinia, Italy / Romano, Marco; Nicosia, Umberto. - In: JOURNAL OF VERTEBRATE PALEONTOLOGY. - ISSN 0272-4634. - STAMPA. - 34:4(2014), pp. 900-913. [10.1080/02724634.2014.837056]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/607797
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