Romeriscus
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| Romeriscus | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Order: | †Diadectomorpha |
| Family: | †Limnoscelidae |
| Genus: | †Romeriscus Baird & Carroll, 1967; Laurin & Reisz, 1992 |
Romeriscus is a dubious genus of tetrapod, currently classified as incertae sedis, found in the Lower Pennsylvanian Port Hood formation in Nova Scotia.[1]
Romeriscus is known by one species, R. periallus, from a single holotype, YPM-PU16 482. The holotype specimen has both cranial and post-cranial remains and consists of a badly crushed skull and 25 pre-sacral vertebrae.
It was originally described in 1967 by Baird & Carroll and hypothesized be a limnoscelid due to its skull structure.[1] In 1992, however, this claim was refuted by Laurin & Reisz, who state that the poor preservation of the skull makes such a claim impossible, and that due to its poor condition, the frontal and postfrontal portions of the skull cannot be properly identified as a limnoscelid.[2] Laurin & Reisz came to the conclusion that while Romeriscus is a distinct genus, it cannot conclusively be classified as amniota, or limnoscelidae, instead classifying it as tetrapoda incertae sedis, and nomen dubium, as its status as a Romeriid is unclear.[3]
References
- ^ a b Baird, D.; Carroll, R. L. (1967-07-07). "Romeriscus, the oldest known reptile". Science (New York, N.Y.). 157 (3784): 56–59. doi:10.1126/science.157.3784.56. ISSN 0036-8075. PMID 6026664.
- ^ Laurin, Michel; Reisz, Robert R. (1992). "A Reassessment of the Pennsylvanian Tetrapod Romeriscus". Journal of Vertebrate Paleontology. 12 (4): 524–527. ISSN 0272-4634.
- ^ J Clark; R L Carroll (1973). Romeriid reptiles from the Lower Permian.