Reconstruction of the skull, white bones are known, light grey bones were known from heavily eroded impressions
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Ornithodira
Clade:
Dinosauromorpha
Genus:
†Pisanosaurus Casamiquela, 1967
Species:
†P. mertii
Binomial name
†Pisanosaurus mertii
Casamiquela, 1967
Pisanosaurus (/pɪsænəˈsɔːrəs/) is an extinct genus of early dinosauriform, likely an ornithischian or silesaurid, from the Late Triassic of Argentina. It was a small, lightly built, ground-dwelling herbivore, that could grow up to an estimated 1 m (3.3 ft) long. Only one species, the type, Pisanosaurus mertii, is known, based on a single partial skeleton discovered in the Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina. This part of the formation has been dated to the late Carnian, approximately 229 million years ago.[1]
^Desojo, Julia B.; Fiorelli, Lucas E.; Ezcurra, Martín D.; Martinelli, Agustín G.; Ramezani, Jahandar; Da Rosa, Átila A. S.; von Baczko, M. Belén; Trotteyn, M. Jimena; Montefeltro, Felipe C.; Ezpeleta, Miguel; Langer, Max C. (2020-07-29). "The Late Triassic Ischigualasto Formation at Cerro Las Lajas (La Rioja, Argentina): fossil tetrapods, high-resolution chronostratigraphy, and faunal correlations". Scientific Reports. 10 (1): 12782. doi:10.1038/s41598-020-67854-1. ISSN 2045-2322. PMC 7391656. PMID 32728077.
millimeters. Pisanosaurus is the type genus of the Pisanosauridae, a family erected by Casamiquela in the same paper which named Pisanosaurus. The family...
to those two groups than thyreophorans. The early Argentinian taxon Pisanosaurus was found to be the most primitive ornithischian, but while overall results...
Pan-Aves were synonyms, with Marasuchus in a clade with lagerpetids. Pisanosaurus was resolved within Silesauridae. Cau identified the synapomorphies of...
mesoeucrocodylian remains. José Bonaparte also classified the South American Pisanosaurus as a heterodontosaurid at one time, but this animal is now known to be...
medium-sized plant eaters. These might have included other dinosaurs, such as Pisanosaurus, as well as the more plentiful rhynchosaurs and synapsids. Herrerasaurus...
rauisuchians, archosaurs, Saurosuchus and the dinosaurs Herrerasaurus and Pisanosaurus, all of whom lived in its paleoenvironment. Herbivores were represented...
15-16 tooth positions in the maxilla, in contrary to the 11 preserved in Pisanosaurus’ (a Late Triassic dinosauriform that may be an ornithischian). There...
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