Pseudosuchian thermometabolism: A review of the past two decades DOI Creative Commons
Mathieu G. Faure‐Brac

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 315 - 341

Published: Dec. 16, 2024

Abstract Pseudosuchia, one of the two main clades Archosauria, is today only represented by some 20 extant species, crocodilians, representing a fraction its extinct diversity. Extant crocodilians are ectotherms but present morphological and anatomical features usually associated with endothermy. In 2004, it was proposed that pseudosuchians were ancestrally endothermic observed in remains this lost legacy. This contribution has parts: first part covers years studies on subject, exploring evidence for loss endothermy before covering variety proxies used to infer thermophymetabolic regime pseudosuchians. second part, quantitative results these previous integrated into comprehensive ancestral state reconstruction discuss potential scenario evolution thermometabolism. Pseudosuchian would then have been close node Crocodylomorpha. The end‐Triassic mass extinction played role filter, leading survival ectothermic ones. difference Pseudosuchia compared those dinosaurs, their metabolism also considered. might different level than dinosaurian more expected clarify question.

Language: Английский

Biotic and abiotic factors and the phylogenetic structure of extinction in the evolution of Tethysuchia DOI Creative Commons
Tom Forêt, Paul Aubier, Stéphane Jouve

et al.

Paleobiology, Journal Year: 2024, Volume and Issue: 50(2), P. 285 - 307

Published: April 23, 2024

Abstract Crocodylomorpha is a large and diverse clade with long evolutionary history now restricted to modern crocodilians. Tethysuchia less-inclusive of semi-amphibious taxa that crossed two biological crises: the second Oceanic Anoxic Event (OAE 2) Cretaceous/Paleogene (K/Pg) crisis. Numerous studies have sought find driving factors explaining crocodylomorph evolution, producing contradictory conclusions. Studies included groups may be useful. Here, we study tethysuchian evolution using phylogenetically informed statistical analyses. First, tested phylogenetic structure extinction at OAE 2 K/Pg crises. We then used comparative methods test influence intrinsic (body size, snout proportion) extrinsic (temperature, paleolatitude) on diversity Finally, whether temperature influenced body size. conclude (1) was not random in regard phylogeny for crises; (2) while an important turnover follows 2, crisis followed by explosion tethysuchians, probably linked colonization emptied ecological niches; (3) tethysuchians lived warmer environments after crisis, possibly because both global warming latitudinal distribution shifts; (4) there significant change proportion crises, likely caused niche partitioning; (5) positive correlation between size temperature, longer growth season.

Language: Английский

Citations

5
Integrative paleophysiology of the metriorhynchoid Pelagosaurus typus (Pseudosuchia, Thalattosuchia) DOI Creative Commons
Jorge Cubo, Mariana Valéria de Araújo Sena,

Romain Pellarin

et al.

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 394 - 411

Published: Aug. 23, 2024

Paleophysiology is an emergent discipline. Organismic (integrative) approaches seem more appropriate than studies focusing on the variation of specific features because traits are tightly related in actual organisms. Here, we used such organismic approach (including lifestyle, thermometabolism, and hunting behavior) to understand paleobiology lower Jurassic (Toarcian) thalattosuchian metriorhynchoid Pelagosaurus typus. First, show that lifestyle (aquatic, amphibious, terrestrial) has effect femoral compactness profiles amniotes. The profile indicates it was with a foraging activity shallow marine environments (as suggested by presence salt glands) thermoregulatory basking behavior land osteoderms highly developed ornamentation). As for mass-independent resting metabolic rate relatively high compared sample extant ectothermic amniotes, but analysis vascular canal diameter inferences red blood cell size refute hypothesis suggesting incipient endothermy. Finally, inferred using two proxies. had maximum aerobic scope higher those measured almost motionless Iguana iguana, similar sit-and-wait predator Crocodylus porosus quantified active hunter Varanus gouldii. These results suggest may have involving slow sustained swimming or patient waiting waters, caught preys like gharials, fast sideways sweeping motions head.

Language: Английский

Citations

5
Pseudosuchian thermometabolism: A review of the past two decades DOI Creative Commons
Mathieu G. Faure‐Brac

The Anatomical Record, Journal Year: 2024, Volume and Issue: 308(2), P. 315 - 341

Published: Dec. 16, 2024

Abstract Pseudosuchia, one of the two main clades Archosauria, is today only represented by some 20 extant species, crocodilians, representing a fraction its extinct diversity. Extant crocodilians are ectotherms but present morphological and anatomical features usually associated with endothermy. In 2004, it was proposed that pseudosuchians were ancestrally endothermic observed in remains this lost legacy. This contribution has parts: first part covers years studies on subject, exploring evidence for loss endothermy before covering variety proxies used to infer thermophymetabolic regime pseudosuchians. second part, quantitative results these previous integrated into comprehensive ancestral state reconstruction discuss potential scenario evolution thermometabolism. Pseudosuchian would then have been close node Crocodylomorpha. The end‐Triassic mass extinction played role filter, leading survival ectothermic ones. difference Pseudosuchia compared those dinosaurs, their metabolism also considered. might different level than dinosaurian more expected clarify question.

Language: Английский

Citations

4