Procolophon

Procolophon is a genus of lizard-like procolophonid reptiles that first appeared in the Late Permian (Lopingian) of South Africa, Brazil, and Antarctica. It persisted through the Permian–Triassic extinction event, but went extinct in the early Triassic. The type species is P. trigoniceps.[1]

Procolophon
Temporal range: Late Permian–Early Triassic
Procolophon pricei from the Early Triassic of South Africa
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: †Parareptilia
Order: †Procolophonomorpha
Family: †Procolophonidae
Subfamily: †Procolophoninae
Genus: †Procolophon
Owen 1876
Type species
Procolophon trigoniceps
Owen 1876
Species
  • P. trigoniceps Owen 1876 (type)

History of discovery

The first Procolophon fossil was discovered in the 1870s in Donnybrook, an area southwest of Pietermaritzburg in present-day Kwa-Zulu Natal of South Africa. The fossil was accessioned to Harry Seeley, who described the fossil in 1878.[2] Numerous other fossils have been recovered since from localities across the Eastern Cape and Free State provinces of South Africa.[3][4][5][6]

Description
Fossil

Procolophon reached a length up to 30 centimetres (12 in), and is considered to have been a small herbivore or insectivore. The skull of Procolophon is distinct because of its latero-posteriorly facing paired cheek spikes, along with spiked dermal ossicles. Paleontologists debate the function of the cheek spikes. Some paleontologists posit that the bony protrusions were points for muscle attachments. Procolophon also had large eyes, and may have had acute night vision. Its teeth were peg-like and suitable for crushing plant matter. The front of the skull was short and blunt with the nasal opening very close to the mouth.[7][8]

Classification

Procolophon is a basal member of Procolophonidae, a clade of parareptiles that are closely related to larger, more derived parareptiles such as the pareiasaur, Bradysaurus. Procolophonids are also related to mesosaurids and millerettids. Procolophon is also considered to share a sister-taxon relationship with Tichvinskia, a procolophonid from the lower Triassic of Russia.[9]

Correlation

Procolophon occupied a wide geographic range. Fossils of the genus were found in the Lystrosaurus Assemblage Zone of the Katberg and Normandien Formations of South Africa, to the Sanga do Cabral Formation of the Paraná Basin in eastern Brazil,[10][11][12] to the Fremouw Formation of the Transantarctic Mountains.[13] Numerous subspecies and sister taxa are also found in the lower Triassic (Induan) of Germany, North America, and Russia.[14][15]

References
  1. Kemp, T.S., 1974. The braincase and associated structures of the cotylosaur reptile Procolophon trigoniceps Owen. Annals of the South African Museum, 64, pp.11-26.
  2. Seeley, Harry Govier (1878-02-01). "On new Species of Procolophon from the Cape Colony preserved in Dr. Grierson's Museum, Thornhill, Dumfriesshire; with some Remarks on the Affinities of the Genus". Quarterly Journal of the Geological Society. 34 (1–4): 797–807. doi:10.1144/GSL.JGS.1878.034.01-04.51. ISSN 0370-291X.
  3. Gow, C.E., 1977. Tooth function and succession in the Triassic reptile Procolophon trigoniceps. Palaeontology, 20(3), pp.695-704.
  4. Carroll, Robert L.; Lindsay, William (1985-11-01). "Cranial anatomy of the primitive reptile Procolophon". Canadian Journal of Earth Sciences. 22 (11): 1571–1587. doi:10.1139/e85-166. ISSN 0008-4077.
  5. Groenewald, G. H. (1991-09-23). "Burrow casts from the Lystrosaurus-Procolophon Assemblage-zone, Karoo Sequence, South Africa". Koedoe. 34 (1): 13–22. doi:10.4102/koedoe.v34i1.409. ISSN 2071-0771.
  6. Cisneros, J.C. (2008-06-03). "Taxonomic status of the reptile genus Procolophon from the Gondwanan Triassic". www.sciencedirect.com. Retrieved 2019-03-11.
  7. deBraga, Michael (2003-04-01). "The postcranial skeleton, phylogenetic position, and probable lifestyle of the Early Triassic reptile Procolophon trigoniceps". Canadian Journal of Earth Sciences. 40 (4): 527–556. doi:10.1139/e02-082. ISSN 0008-4077.
  8. Cisneros, Juan Carlos; Ruta, Marcello (2010-11-03). "Morphological diversity and biogeography of procolophonids (Amniota: Parareptilia)". Journal of Systematic Palaeontology. 8 (4): 607–625. doi:10.1080/14772019.2010.491986. ISSN 1477-2019.
  9. Ivakhnenko, M.F., 1973. Skull structure in the Early Triassic procolophonian Tichvinskia vjatkensis. Paleontological Journal, 7, pp.511-518.
  10. Dias-da-Silva, Sérgio; Modesto, Sean Patrick; Schultz, Cesar Leandro (2006-11-01). "New material of Procolophon (Parareptilia: Procolophonoidea) from the Lower Triassic of Brazil, with remarks on the ages of the Sanga do Cabral and Buena Vista formations of South America". Canadian Journal of Earth Sciences. 43 (11): 1685–1693. doi:10.1139/e06-043. ISSN 0008-4077.
  11. Cisneros, J.C. and Schultz, C.L., 2002. Procolophon brasiliensis n. sp., a new procolophonid reptile from the Lower Triassic of southern Brazil. NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE MONATSHEFTE, (11), pp.641-648. PDF: https://a2708806-a-62cb3a1a-s-sites.googlegroups.com/site/palaeocisneros/publications/Cisneros%26Schultz2002Procolophonbrasiliensis.pdf?attachauth=ANoY7cpbBY-pRU5vYjnTdE_2T3S3R-yt1AdLnsFlRAeuXYV7uLhhkNH55sCaTDJZwJ-SR1YcorHu4c68ycZZCQEu3rkpc3VUVgC1KJOb2wcN_FFi1rpHntxCrWQGvfP0FkwDZJLiibR2VztvFUcLiE6CA9tu_tWs6gJ9RXJ30OfLPnRL4gCMvrwaY-3B2Qs8yiBf8C-SM1UgnubIxdLNzF4cLyW0Wl86-NWW4iIKZtIRLoBrxQitkOrS_9ukyzQjB1pc0Wt6SZUUrBuOEEh4ZRZvA5nA-U-c7A%3D%3D&attredirects=0
  12. Schoch, Rainer R. (2011-02-01). "A procolophonid-like tetrapod from the German Middle Triassic". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 259 (2): 251–255. doi:10.1127/0077-7749/2011/0124. ISSN 0077-7749.
  13. Colbert, Edwin H.; Elliot, David H.; Collinson, James W.; Kitching, James W. (1972-02-04). "Lystrosaurus Zone (Triassic) Fauna from Antarctica". Science. 175 (4021): 524–527. doi:10.1126/science.175.4021.524. ISSN 0036-8075. PMID 17755654.
  14. Säilä, Laura K. (2008-12-12). "The osteology and affinities of Anomoiodon liliensterni, a procolophonid reptile from the Lower Triassic Bundsandstein of Germany". Journal of Vertebrate Paleontology. 28 (4): 1199–1205. doi:10.1671/0272-4634-28.4.1199. ISSN 0272-4634.
  15. Sues, Hans-Dieter; Olsen, Paul E.; Scott, Diane M.; Spencer, Patrick S. (2000-06-27). "Cranial osteology of Hypsognathus fenneri, a latest Triassic procolophonid reptile from the Newark Supergroup of eastern North America". Journal of Vertebrate Paleontology. 20 (2): 275–284. doi:10.1671/0272-4634(2000)020[0275:COOHFA]2.0.CO;2. ISSN 0272-4634.
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