Pisanosaurus mertii Casamiquela, 1967
publication ID |
https://doi.org/ 10.1206/352.1 |
DOI |
https://doi.org/10.5281/zenodo.5476380 |
persistent identifier |
https://treatment.plazi.org/id/357D771B-FF9B-FF91-EDF6-FBD4FEF8FE56 |
treatment provided by |
Tatiana |
scientific name |
Pisanosaurus mertii Casamiquela, 1967 |
status |
|
Pisanosaurus mertii Casamiquela, 1967
AGE: Late Carnian–early Norian, Late Triassic ( Rogers et al., 1993, adjusted for the new Triassic timescale of Muttoni et al., 2004).
OCCURRENCE: Middle portion of the Ischigualasto Formation, Ischigualasto basin, Argentina.
HOLOTYPE: PVL 2577, tooth-bearing elements, vertebrae, incomplete hind limb, impression of the pelvis.
REMARKS: Since its discovery, Pisanosaurus was considered the most primitive ornithischian ( Casamiquela, 1967; Bonaparte, 1976; Weishampel and Witmer, 1990; Sereno, 1991b; Irmis et al., 2007a; Butler et al., 2007, 2008b). However, questions about the association of the material plagued certainty regarding the validity of the taxon. Our current understanding of the taxon can be better understood only with the discovery of a new specimen. However, Pisanosaurus is almost always found as the basalmost member of Ornithischia ( Langer and Benton, 2006; Butler et al., 2007, 2008b; Irmis et al., 2007a) because of the combination of ornithischian synapomorphies and archosaur plesiomorphies, such as the anteroventrally directed pubis.
KEY REFERENCES: Casamiquela, 1967; Bonaparte, 1976; Weishampel and Witmer, 1990; Sereno, 1991b; Irmis et al., 2007a; Butler et al., 2008b.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.