The early evolution of archosaurs : relationships and the origin of major clades / Sterling J. Nesbitt
Archosaurs have a nearly 250 million year record that originated shortly after the Permian-Triassic extinction event and is continued today by two extant clades, the crocodylians and the avians. The two extant lineages exemplify two bauplan extremes among a diverse and complex evolutionary history,...
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Superior document: | Bulletin of the American Museum of Natural History 352 |
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Place / Publishing House: | New York : American Museum of Natural History, 2011 |
Year of Publication: | 2011 |
Language: | English |
Series: | Bulletin of the American Museum of Natural History
352 |
Physical Description: | 292 S.; Ill., graph. Darst.; 26 cm |
Notes: | Literaturverz. S. 256 - 275 |
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Nesbitt, Sterling J. (DE-588)136352421 aut <<The>> early evolution of archosaurs relationships and the origin of major clades Sterling J. Nesbitt New York American Museum of Natural History 2011 292 S. Ill., graph. Darst. 26 cm Bulletin of the American Museum of Natural History 352 Literaturverz. S. 256 - 275 Archosaurs have a nearly 250 million year record that originated shortly after the Permian-Triassic extinction event and is continued today by two extant clades, the crocodylians and the avians. The two extant lineages exemplify two bauplan extremes among a diverse and complex evolutionary history, but little is known about the common ancestor of these lineages. Renewed interest in early archosaurs has led to nearly a doubling of the known taxa in the last 20 years. This study presents a thorough phylogenetic analysis of 80 species-level taxa ranging from the latest Permian to the early part of the Jurassic using a dataset of 412 characters. Each terminal taxon is explicitly described and all specimens used in the analysis are clearly stated. Additionally, each character is discussed in detail and nearly all of the character states are illustrated in either a drawing or highlighted on a specimen photograph. A combination of novel characters and comprehensive character sampling has b Basal crocodylomorphs such as Hesperosuchus and similar forms ("Sphenosuchia") were found as a paraphyletic grade leading to the clade Crocodyliformes. Among avian-line archosaurs, Dinosauria is well supported. A monophyletic clade containing Silesaurus and similar forms is well supported as the sister taxon to Dinosauria. Pterosaurs are robustly supported at the base of the avian line. A time-calibrated phylogeny of Archosauriformes indicates that the origin and initial diversification of Archosauria occurred during the early Triassic following the Permian-Triassic extinction. Furthermore, all major basal archosaur lineages except Crocodylomorpha were established by the end of the Anisian. Early archosaur evolution is characterized by high rates of homoplasy, long ghost lineages, and high rates of character evolution. These data imply that much of the early history of Archosauria has not been recovered from the fossil record. Not only were archosaurs diverse by the Middle Triassic, Archosauria Archosauria / Geographical distribution Reptiles, Fossil Reptiles / Phylogeny Reptiles / Evolution Crocodilians / Evolution Birds / Evolution Dinosaurs / Evolution Reptiles, Fossil / Geographical distribution Paleontology / Permian Paleontology / Mesozoic (AT-OBV)AC00277083 352 YWOAW MAG2-1 100233.352 2218655590004498 |
language |
English |
format |
Book |
author |
Nesbitt, Sterling J. |
spellingShingle |
Nesbitt, Sterling J. The early evolution of archosaurs relationships and the origin of major clades Bulletin of the American Museum of Natural History |
author_facet |
Nesbitt, Sterling J. |
author_variant |
s j n sj sjn |
author_role |
VerfasserIn |
author_sort |
Nesbitt, Sterling J. |
title |
The early evolution of archosaurs relationships and the origin of major clades |
title_sub |
relationships and the origin of major clades |
title_full |
The early evolution of archosaurs relationships and the origin of major clades Sterling J. Nesbitt |
title_fullStr |
The early evolution of archosaurs relationships and the origin of major clades Sterling J. Nesbitt |
title_full_unstemmed |
The early evolution of archosaurs relationships and the origin of major clades Sterling J. Nesbitt |
title_auth |
The early evolution of archosaurs relationships and the origin of major clades |
title_new |
The early evolution of archosaurs |
title_sort |
early evolution of archosaurs relationships and the origin of major clades |
series |
Bulletin of the American Museum of Natural History |
series2 |
Bulletin of the American Museum of Natural History |
publisher |
American Museum of Natural History |
publishDate |
2011 |
physical |
292 S. Ill., graph. Darst. 26 cm |
callnumber-subject |
B - Philosophy |
callnumber-label |
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B |
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100233.352 |
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Illustrated |
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<<The>> early evolution of archosaurs relationships and the origin of major clades |
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Bulletin of the American Museum of Natural History 352 |
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AC00277083 |
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