Stegotretus
| Stegotretus Temporal range:
Early Permian | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Order: | †Microsauria |
| Clade: | †Recumbirostra |
| Family: | †Gymnarthridae |
| Genus: | †Stegotretus Berman, Eberth & Brinkman, 1988 |
| Type species | |
| †Stegotretus agyrus Berman, Eberth & Brinkman, 1988
| |
Stegotretus is an extinct genus of microsaur referred to the Pantylidae. It is known from the Carboniferous–Permian boundary Cutler Formation exposures of New Mexico.[1]
History of study
Material now referred to Stegotretus was first described (in brief) by Eberth & Berman (1983).
Anatomy
Despite the large number of specimens of Stegotretus, many are poorly preserved or distorted. Stegotretus is diagnosed by the presence of only two premaxillary teeth and by a large circular fenestra on the palatine. A contact between the maxilla and the quadratojugal and the absence of an entepicondylar foramen on the humerus separate it from the purportedly closely related Pantylus.
Relationships
Stegotretus was classified as a pantylid by Berman et al. (1988). This has been validated by phylogenetic analyses that include the taxon,[4][5][6] although it is sometimes recovered as being more closely related to Sparodus than to Pantylus when all three taxa are sampled.[7] Below is the result of the analysis by Huttenlocker et al. (2013):
| Microsauria |
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References
- ^ a b c Berman, D.S.; Eberth, D.A.; Brinkman, D.B. (1988). "Stegotretus agyrus, a new genus and species of microsaur (amphibian) from the Permo-Pennsylvanian of New Mexico". Annals of Carnegie Museum. 57: 293–323.
- ^ Eberth, David A.; Berman, David S (1983). "Sedimentology and paleontology of Lower Permian fluvial redbeds of north-central New Mexico - preliminary report" (PDF). New Mexico Geology. 5: 21–25.
- ^ Liddell, H.G. & Scott, R. (1940). A Greek-English Lexicon. Revised and augmented throughout by Sir Henry Stuart Jones with the assistance of Roderick McKenzie.Oxford: Clarendon Press.
- ISSN 0272-4634.
- ISSN 1076-836X.
- PMID 30631641.
- PMID 14667343.
