Named By: M. G. Mehl - 1913.
Classification: Chordata, Phytosauria, Phytosauridae.
Species: A. grandis (type), A. talainti?
Size: Skull of A. grandis about 120 centimetres long.
Known locations: USA, Arizona - Chinle Formation, New Mexico - Santa Rosa Formation, Texas - Colorado City Formation and Wyoming - Popo Agie Formation. Possibly Morocco.
Time period: Norian/Rhaetian of the Triassic.
Fossil representation: Several individuals mostly known from skulls, but some post cranial remains also known.
skulls measuring about one hundred and twenty centimetres long,
Angistorhinus was easily amongst the largest phytosaurs,
crocodile-like reptiles that hunted in Triassic waterways. The jaws
of Angistorhinus were long and thin, more akin to
those of a gharial,
perhaps indicating that Angistorhinus was more of
a fish hunter. The
nostrils of Angistorhinus were situated further
back on the skull,
a feature that is not just indicative of a more advanced phytosaur
form, but also kept the nostrils free from the water when the snout
was dipped underneath.
Angistorhinus has in the past been considered as a synonym to the genus Rutiodon, but later studies have continued to retain Angistorhinus as a distinct genus. One sometimes mentioned species of Angistorhinus, A. megalodon, is more often credited as the genus Brachysuchus. Fossils from Morocco have been tentatively place in the genus as a new species, A. talainti.
- Angistorhinus, a new genus of Phytosauria from the Trias of Wyoming. - Journal of Geology 21:186-191. - M. G. Mehl - 1913.
- Description du craˆne de Angistorhinus talainti n. sp. un nouveau Phytosaure du Trais atlasique marocain. - Bulletin du Muséum National d'Histoire Naturelle 3 (489): 297–336. - J. -M. Dutuit - 1977.
- Status and phylogenetic relationships of the Late Triassic phytosaur Rutiodon carolinensis. - Journal of Vertebrate Paleontology 21 (3 Suppl.): 64A. - A. Hungerbühler - & H. -D. Sues - 2001.
- Postcranial anatomy of Angistorhinus, a Late Triassic phytosaur from West Texas. - S. G. Lucas, A. B. Heckert & R. Kahle - 2002. In Upper Triassic Stratigraphy and Paleontology, New Mexico Museum of Natural History and Science Bulletin 21: 157–164 (A. B. Heckert, S. G. Lucas - eds). 2002.
- A new taxon of phytosaur (Archosauria: Pseudosuchia) from the Late Triassic (Norian) Sonsela Member (Chinle Formation) in Arizona, and a critical re-evaluation of Leptosuchus Case, 1922. - Palaeontology 53 (5): 997–1022. - Michelle R. Stocker - 2010.