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[dinosaur] Arganasaurus (Triassic metoposaurid) + evolution of temnospondyls issue

Ben Creisler

Some additional recent temnospondyl stuff...

Arganasaurus azerouali comb. nov.Â

Valentin Buffa, ÂNourâEddine Jalil Â& ÂJ.âSebastien Steyer (2019)
Redescription of Arganasaurus (Metoposaurus) azerouali (Dutuit) comb. nov. from the Upper Triassic of the Argana Basin (Morocco), and the first phylogenetic analysis of the Metoposauridae (Amphibia, Temnospondyli).
Papers in Palaeontology (advance online publication)
doi: https://doi.org/10.1002/spp2.1259

A systematic revision of the temnospondyl 'Metoposaurus' azerouali Dutuit from the Late Triassic of the Argana Basin (Western High Atlas, Morocco) is presented. The type material is redescribed in detail, and a preliminary phylogenetic analysis -- the first one dealing with all metoposaurid species -- is also conducted in order to test its position within the Metoposauridae. Our analysis places 'Metoposaurus' azerouali as sisterâtaxon to Arganasaurus lyazidi in a robust clade supported by two unambiguous synapomorphies (bulgeâlike tabular horn and exoccipital process visible in dorsal view) and two ambiguous synapomorphies (cultriform process of uniform width and subtriangular posterior Meckelian fenestra). We therefore propose the new combination Arganasaurus azerouali comb. nov. for the species 'M.' azerouali. Our analysis also confirms that the central Laurasian genus Metoposaurus is monophyletic but not the genus Koskinonodon, which deserves its own systematic revision. By consequent, the Late Triassic rich vertebrate fauna from the Argana Basin comprises the metoposauroid Almasaurus habazzi, the basal metoposaurid Dutuitosaurus ouazzoui, and the genus Arganasaurus which is represented by the type species A. lyazidi and A. azerouali comb. nov. Combined with the stratigraphical and geographical occurrences of the taxa, our phylogenetic analysis suggests that metoposaurids may have appeared during the Longobardian (late Ladinian) in central Pangea. Their diversification may be linked to the Carnian Pluvial Episode. At least, their extinction may have occurred during the Rhaetian because of the aridification of the climate and/or competition with amniotes.


Special Issue of Iberian Geology 45(2), June 2019
New insights into evolution of temnospondyls

The papers have been posted earlier in advance form.


Final form citations:

Josep Fortuny & J.-SÃbastien Steyer (2019)
New insights into the evolution of temnospondyls.
Journal of Iberian Geology 45(2): Â247-250
DOI: https://doi.org/10.1007/s41513-019-00104-0


Estevan Eltink, Rainer R. Schoch & Max C. Langer (2019)
Interrelationships, palaeobiogeography and early evolution of Stereospondylomorpha (Tetrapoda: Temnospondyli).
Journal of Iberian Geology 45(2): 251-267
DOI: Âhttps://doi.org/10.1007/s41513-019-00105-z


Meritxell FernÃndez-Coll, Thomas Arbez, Federico Bernardini & Josep Fortuny (2019)
Cranial anatomy of the Early Triassic trematosaurine Angusaurus (Temnospondyli: Stereospondyli): 3D endocranial insights and phylogenetic implications.
Journal of Iberian Geology 45(2): 269-286
DOI: https://doi.org/10.1007/s41513-018-0064-4


Dorota Konietzko-Meier, Jennifer D. Werner, Tanja Wintrich & P. Martin Sander (2019)
A large temnospondyl humerus from the Rhaetian (Late Triassic) of Bonenburg (Westphalia, Germany) and its implications for temnospondyl extinction.
Journal of Iberian Geology 45(2): 287-300
DOI: https://doi.org/10.1007/s41513-018-0092-0


Kamil Gruntmejer, Dorota Konietzko-Meier, Adam Bodzioch & Josep Fortuny (2019)
Morphology and preliminary biomechanical interpretation of mandibular sutures in Metoposaurus krasiejowensis (Temnospondyli, Stereospondyli) from the Upper Triassic of Poland.
Journal of Iberian Geology 45(2): 301-316
DOI: https://doi.org/10.1007/s41513-018-0072-4

Free pdf:


Sanjukta Chakravorti & Dhurjati Prasad Sengupta (2019)
Taxonomy, morphometry and morphospace of cranial bones of Panthasaurus gen. nov. maleriensis from the Late Triassic of India.
Journal of Iberian Geology Â45(2): 317-340
DOI: https://doi.org/10.1007/s41513-018-0083-1


Celeste M. PÃrez-Ben & RaÃl O. GÃmez (2019)
Morphological integration and evolution of the skull roof in temnospondyl amphibians.
Journal of Iberian Geology 45(2): 341-351
DOI: https://doi.org/10.1007/s41513-018-0088-9


Lorenzo Marchetti Â(2019)
Can undertracks show higher morphologic quality than surface tracks? Remarks on large amphibian tracks from the Early Permian of France.
Journal of Iberian Geology 45(2): 353-363
DOI: https://doi.org/10.1007/s41513-018-0080-4


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