Fasolasuchus
| Fasolasuchus | ||||||||||||
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Live reconstruction of Fasolasuchus |
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| Temporal occurrence | ||||||||||||
| Upper Triassic ( Norium to Rhaetium ) | ||||||||||||
| 228 to 201.3 million years | ||||||||||||
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| Scientific name | ||||||||||||
| Fasolasuchus | ||||||||||||
| Bonaparte , 1981 | ||||||||||||
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Fasolasuchus is an extinct genus of Loricata from the group of Crurotarsi . Fossils come from the Argentine Los Colorados Formation and are dated to the Upper Triassic . The first find ( holotype , specimen number PVL 3850) wasscientifically describedin 1981 by the Argentine paleontologist José Fernando Bonaparte . The only species is Fasola suchus tenax .
features
The size of the limbs and the upper jaw suggest that Fasolasuchus was one of the largest crurotarsi of the Triassic and probably reached a length of 8 to 10 meters. The spine was stiffened by additional mechanical connecting elements ( hyposphene-hypantrum connections ), which can also be observed in other Rauisuchia and in the saurischia .
Systematics
The exact systematic position of Fasolasuchus is not clear. The relationship analysis by Stephen Brusatte et al. (2010) found that Fasolasuchus forms a clade together with Ticinosuchus , Stagonosuchus and Arganasuchus . The sister taxon of this clade includes the Prestosuchidae ( Saurosuchus , Batrachotomus and Prestosuchus ) and the Rauisuchidae ( Tikisuchus , Teratosaurus , Rauisuchus and Postosuchus ). These two, developed by Brusatte et al. clades not specifically designated together as Rauisuchoidea named group within the Rauisuchia . According to the research by Nesbitt (2011), the Rauisuchia are paraphyletic , i.e. they do not share a recent common ancestor. Fasolasuchus occupies a basal position there within a clade called Loricata , which also includes today's crocodiles . The sister taxon of Fasolasuchus is an unnamed group that includes the Rauisuchidae and the Crocodylomorpha . These relationships are shown in the following cladogram (Nesbitt, 2011):
| Paracrocodylomorpha |
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Individual evidence
- ↑ a b c Sterling J. Nesbitt: The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades (= Bulletin of the American Museum of Natural History. No. 352, ISSN 0003-0090 ). American Museum of Natural History, New York NY 2011, doi : 10.1206 / 352.1 , digital version (PDF; 32.69 MB) .
- ^ Jonathan C. Weinbaum, Axel Hungerbühler: A revision of Poposaurus gracilis (Archosauria: Suchia) based on two new specimens from the Late Triassic of the southwestern USA In: Paläontologische Zeitschrift. Vol. 81, No. 2, 2007, ISSN 0031-0220 , pp. 131-145, doi : 10.1007 / BF02988388 .
- ^ Sebastián Apesteguía: Evolution of the hyposphene-hypantrum complex within Sauropoda. In: Virginia Tidwell, Kenneth Carpenter (Eds.): Thunder-lizards. The Sauropodomorph dinosaurs. Indiana University Press, Bloomington IN et al. 2005, ISBN 0-253-34542-1 , pp. 248-267.
- ↑ Stephen L. Brusatte, Michael J. Benton , Julia B. Desojo, Max C. Langer: The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida). In: Journal of Systematic Palaeontology. Vol. 8, No. 1, 2010, ISSN 1477-2019 , pp. 3-47, doi : 10.1080 / 14772010903537732