Parrishia
| Parrishia Temporal range:Late Triassic
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|---|---|
Scientific classification
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Archosauria |
| Clade: | Pseudosuchia |
| Clade: | Crocodylomorpha |
| Genus: | †Parrishia Long and Murry,1995 |
| Type species | |
| †P. mccreai Long and Murry, 1995
| |
Parrishiais an extinctgenusofsphenosuchiancrocodylomorphknown from the Late TriassicChinle,Dockum,andSanta Rosa FormationsinArizonaandNew Mexico.
Discovery and naming
[edit]The genus was named in 1995 from fossils found from thePlaceriasquarry of theChinle GroupinApache County, Arizona.[1]It was named after thepaleontologistJ. Michael Parrish,with thetype speciesbeingP. mccreai.Parrishiawas distinguished from the closely related genusHesperosuchuson the basis of more robust vertebral centra and the lack of dorsoventrally offset articular faces of the cervical centra, thus causing the neck to be straight rather than anterodorsally curved as inHesperosuchus.[1]
In their description of a new crocodylomorph skeleton from the famous Whitaker quarry in Ghost Ranch, Clark et al. (2000) treatedParrishiaas anomen dubiumbecause they considered the holotype and referred specimens undiagnostic.[2]More complete postcranial skeletons such as PEFO 26681 have been found that clearly show that the cervical centra ofParrishiapossess articular faces that are dorsoventrally offset as inHesperosuchus.[3]Additionally, in the holotype specimen (UCMP A269/139623) the anterior surfaces of the centa are positioned more dorsally than the posterior surfaces, giving the neck an anterodorsal curve likeHesperosuchus.[2][4]Therefore, the only distinguishing character that distinguishesParrishiafromHesperosuchusis the robustness of the vertebrae.[3]Material fromParrishiacannot be assigned to any other known sphenosuchian genus because of the lack of postcranial apomorphies; as a result, it is considered an indeterminate genus.[5]
In an SVP 2018 conference abstract, William Parker and colleagues reported the discovery of new specimens indicating thatParrishiarepresents a phytosaur and not a crocodylomorph.[6]
References
[edit]- ^abLong, R. A.; Murry, P. A. (1995). "Late Triassic (Carnian and Norian) tetrapods from the southwestern United States".New Mexico Museum of Natural History and Science Bulletin.4:1–254.
- ^abClark, J. M.; Sues, H.-D.; Berman, D. S. (2000). "A new specimen ofHesperosuchus agilisfrom the Upper Triassic of New Mexico and the interrelationships of basal crocodylomorph archosaurs ".Journal of Vertebrate Paleontology.20(4): 683–704.doi:10.1671/0272-4634(2000)020[0683:ANSOHA]2.0.CO;2.S2CID7455338.
- ^abParker, W. G.; Irmis, R. B. (2005). "Advances in Late Triassic vertebrate paleontology based on new material from Petrified Forest National Park, Arizona". In Heckert, A. B.; Lucas, S. G. (eds.).Vertebrate Paleontology in Arizona.New Mexico Museum of Natural History and Science Bulletin. Vol. 29. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. pp. 45–58.
- ^Colbert, E. H. (1952). "A pseudosuchian reptile from Arizona".Bulletin of the American Museum of Natural History.99:561–592.
- ^Irmis, R. B. (2005). "The vertebrate fauna of the Upper Triassic Chinle Formation in Northern Arizona". In Sterling J. Nesbitt; William G. Parker; Randall B. Irmis (eds.).Guidebook to the Triassic Formations of the Colorado Plateau in Northern Arizona: Geology, Paleontology, and History.Vol. 9. Bulletin of the Mesa Southwest Museum.
- ^"Program booklet".vertpaleo.org. 2018.Retrieved2020-02-06.
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