Ignotosaurus fragilis
By Jack Wood on @thewoodparable
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Name: Ignotosaurus fragilis
Name Meaning: Unknown Reptile
First Described: 2013
Described By: Martínez et al.
Classification: Avemetatarsalia, Ornithodira, Dinosauromorpha, Dinosauriformes, Silesauridae
Ignotosaurus is a Silesaurid from the Ischigualasto Formation of Argentina, living about 231.4 million years ago, in the Carnian age of the Late Triassic. It is known from part of the leg bone, which indicates it was a small Silesaurid. This difference in leg bone probably indicates that it differed from other Silesaurids mainly in its method or needs during locomotion. It was closely related to Eucoelophysis, Silesaurus, and Sacisaurus, making it a fairly derived member of the Silesaurid group. Ignotosaurus lived in a complex community with many other species of reptiles, including early dinosaurs and other Archosauromorphs, such as Scaphonyx, Herrerasaurus, Proterochampsa, Chanaresuchus, Saurosuchus, Sillosuchus, Trialestes, Aetosauroides, Panphagia, Eoraptor, Chromogisaurus, Eodromaeus, and Sanjuansaurus. However, compared to, say, Herrerasaurus and Scaphonyx, or really, many others in this formation, it was relatively rare - indicating it was not a very common component of this ecology.
Source:
Martínez, R. N.m C. Apaldetti, O. A. Alcober, C. E. Colombi, P. C. Sereno, E. Fernandez, P. S. Malnis, G. A. Correa, D. Abelin. 2013. Vertebrate succession in the Ischigualasto Formation. Journal of Vertebrate Paleontology 32 (sup1): 10-30.
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