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| Temnospondyli | |
|---|---|
| Name | Temnospondyli |
| Fossil range | Carboniferous–Cretaceous |
| Kingdom | Animalia |
| Phylum | Chordata |
| Classis | Amphibia |
| Ordo | Temnospondyli |
Temnospondyli are an extinct, diverse assemblage of early Amphibia known from the Carboniferous through the Cretaceous that include small, salamander-like forms and large, crocodile-like predators. Important in studies of paleozoic life and mesozoic ecosystems, they have been central to debates involving the origins of modern Lissamphibia, patterns of terrestrialization, and vertebrate recovery after the Permian–Triassic extinction event. Specimens from notable localities have influenced interpretations by researchers affiliated with institutions such as the Natural History Museum, London, the Smithsonian Institution, and the Muséum national d'Histoire naturelle.
Temnospondyls exhibit a wide range of morphologies from diminutive, gracile skulls to massive, flat-headed forms reminiscent of Saltwater crocodile proportions. Cranial anatomy shows complex dermal roofing bones with interdigitating sutures studied by teams at University of Cambridge, University of Chicago, and University of Bonn; these studies compared specimens to material described by paleontologists like Richard Owen, Edward Drinker Cope, and Othniel Charles Marsh. The vertebral structure displays variations between multipartite centra and fused elements, paralleling discussions found in publications from Geological Society of America and Palaeontological Association. Limb girdles and limb bones range from robust, weight-bearing types seen in terrestrial genera recovered from sites curated by the Natural History Museum of Los Angeles County to slender, paddle-like forms interpreted in faunas reported from Gröden/Val Gardena and the Karoo Basin. Sensory canals preserved on skulls have been compared to those used in studies at the Max Planck Institute for Evolutionary Anthropology and inform functional analogies with taxa discussed in works housed at the American Museum of Natural History.
Classification of these amphibians has been refined in monographs produced by researchers at the University of Chicago, University of Toronto, and University of Oxford. Early taxonomic history involved names proposed by Thomas Huxley and later revisions by Friedrich von Huene and Werner Janensch. Modern phylogenetic frameworks utilize datasets shared among the Society of Vertebrate Paleontology, the Royal Society, and contributors to journals like Nature and Journal of Vertebrate Paleontology. Competing hypotheses link members to clades discussed in systematic treatments alongside Captorhinida and Synapsida; some analyses by teams at the University of Bristol and University of California, Berkeley place certain lineages as stem relatives to modern frogs and salamanders, while others retain them as a distinct radiation. Major subdivisions and families have been named in association with collections held at the Field Museum of Natural History, University of Michigan Museum of Paleontology, and the Paleontological Research Institution.
The fossil record begins in Mississippian deposits described from regions investigated by expeditions from the British Museum and the University of Edinburgh. Key Lagerstätten such as sites in the Mazon Creek and Linton (Ohio) localities yielded specimens that informed early narratives advanced by workers from the Carnegie Institution and the Yale Peabody Museum. Surviving the Permian–Triassic extinction event in forms tracked by teams at the University of Tokyo and Chinese Academy of Sciences, they diversified in the Triassic alongside synapsid and archosaur faunas cataloged by the University of Zurich and the Dinosaur Provincial Park program. Later occurrences into the Jurassic and isolated Cretaceous records have been documented in collections at the Royal Ontario Museum and by expeditions funded through grants from the National Science Foundation.
Functional interpretations derive from comparative work with extant taxa studied at the Smithsonian Tropical Research Institute, the Royal Botanic Gardens, Kew, and laboratories at the University of Melbourne. Dentition and jaw mechanics indicate piscivory and macroinvertebrate predation in many taxa, paralleling feeding models developed for Alligator mississippiensis and cited in collaborative papers with the Woods Hole Oceanographic Institution. Limb and trackway evidence associated with finds reported by the Paleontological Society suggest semiaquatic to fully terrestrial lifestyles in different lineages, mirroring ecological partitions explored by researchers at the Scripps Institution of Oceanography and University of Sydney. Growth series from bone histology, a method refined at the University of Bonn and the University of Florida, reveal life histories with variable growth rates and possible seasonal cues comparable to those inferred for taxa in studies by the Max Planck Society.
Specimens have been recovered across Palaeozoic and Mesozoic basins in North America, Europe, Asia, Africa, South America, and Antarctica, with prominent localities including the Mazon Creek, the Karoo Basin, the Isle of Skye, and the Lacustrine basins of Xinjiang. Temporal span covers the Carboniferous, Permian, Triassic, Jurassic, and sparse Cretaceous records, paralleling continental arrangements reconstructed by the Pangaea model and plate tectonic syntheses advanced by the United States Geological Survey and the British Geological Survey.
Extinction patterns involve regional declines after the Triassic–Jurassic extinction event and final disappearances by the Cretaceous in some areas, a topic examined in symposia organized by the International Palaeontological Congress and reports to the National Academy of Sciences. Their legacy persists in ongoing debates about the ancestry of Lissamphibia and in morphological concepts taught in courses at the University of Oxford and the University of Cambridge. Major museum exhibits at the Natural History Museum, London, the Field Museum, and the Smithsonian National Museum of Natural History continue to present temnospondyl fossils to the public, linking deep-time evolutionary narratives to modern biodiversity discussions led by organizations such as the World Wildlife Fund.
Category:Fossil amphibians