The neodiapsid Thadeosaurus colcanapi from the upper Permian of Madagascar DOI Creative Commons
Valentin Buffa, Nour‐Eddine Jalil,

Jocelyn Falconnet

et al.

Papers in Palaeontology, Journal Year: 2025, Volume and Issue: 11(2)

Published: March 1, 2025

Abstract The enigmatic neodiapsid Thadeosaurus colcanapi (Lower Sakamena Formation, southwestern Madagascar), sole species of the genus , is revised here. attribution 12 21 referred specimens confirmed, spanning all ontogenetic stages, and anatomy redescribed in detail with comments on ontogenetical differences. This new anatomical information included an expanded phylogenetical dataset tailored to examine relationships Permo‐Triassic diapsids. A stem‐saurian position confirmed here for ‘younginiforms’, which are recovered paraphyletic, Youngina representing earlier‐diverging taxon. However, this topology extremely labile, monophyly or paraphyly ‘younginiforms’ could not be unequivocally supported. In contrast, our analyses provide good support a monophyletic Tangasauridae including other ‘younginiforms’. as member sister‐group putative semi‐aquatic Tangasaurinae moderate degree support, despite large amounts missing data lesser‐known tangasaurids partially obscuring understanding tangasaurid interrelationships. Last, considered have inhabited nearshore, probably riparian, environment, although it remains unclear whether was fully terrestrial. Further examinations tangasaurids, well novel morphotype identified Lower Formation Madagascar, evidence deepen evolution palaeoecology Tangasauridae.

Language: Английский

New information on the anatomically derived millerettid Milleretta rubidgei from the latest Permian based on µCT data DOI
Xavier A. Jenkins, Roger Benson,

Matthew Elliott

et al.

Zoological Journal of the Linnean Society, Journal Year: 2025, Volume and Issue: 203(3)

Published: March 1, 2025

Abstract The fossil reptile Milleretta holds a prominent role in phylogenetic analyses of early relationships. It has often been used as the sole marker for anatomically diverse middle to late Permian Millerettidae, clade that hypothesized earliest diverging parareptiles and therefore only distantly related crown group. However, anatomy remains incompletely documented, presenting an obstacle studies evolution. We re-examine cranial rubidgei using synchrotron micro-computed tomography two specimens, representing juvenile subadult. These immature individuals have clearly visible sutures, differing from osteologically mature individuals, which osteoderms obscure anatomy, particularly antorbital region. demonstrate other millerettids share many derived similarities with Neodiapsida (a includes group), neurocranium palatoquadrate. Comparison reveals some features seen adult specimens are, fact, features, resulting secondary modification individuals. observations suggest is millerettid urge caution this taxon semaphorant disparate group stem reptiles.

Language: Английский

Citations

1
The neodiapsid Thadeosaurus colcanapi from the upper Permian of Madagascar DOI Creative Commons
Valentin Buffa, Nour‐Eddine Jalil,

Jocelyn Falconnet

et al.

Papers in Palaeontology, Journal Year: 2025, Volume and Issue: 11(2)

Published: March 1, 2025

Abstract The enigmatic neodiapsid Thadeosaurus colcanapi (Lower Sakamena Formation, southwestern Madagascar), sole species of the genus , is revised here. attribution 12 21 referred specimens confirmed, spanning all ontogenetic stages, and anatomy redescribed in detail with comments on ontogenetical differences. This new anatomical information included an expanded phylogenetical dataset tailored to examine relationships Permo‐Triassic diapsids. A stem‐saurian position confirmed here for ‘younginiforms’, which are recovered paraphyletic, Youngina representing earlier‐diverging taxon. However, this topology extremely labile, monophyly or paraphyly ‘younginiforms’ could not be unequivocally supported. In contrast, our analyses provide good support a monophyletic Tangasauridae including other ‘younginiforms’. as member sister‐group putative semi‐aquatic Tangasaurinae moderate degree support, despite large amounts missing data lesser‐known tangasaurids partially obscuring understanding tangasaurid interrelationships. Last, considered have inhabited nearshore, probably riparian, environment, although it remains unclear whether was fully terrestrial. Further examinations tangasaurids, well novel morphotype identified Lower Formation Madagascar, evidence deepen evolution palaeoecology Tangasauridae.

Language: Английский

Citations

0