Biology:Gorgonops

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Gorgonops (from Greek: Γοργών 'Gorgon' and ὤψ 'eye, face', literally 'Gorgon eye' or 'Gorgon face') is an extinct genus of gorgonopsian therapsid, of which it is the type genus. Gorgonops lived during the Late Permian (Wuchiapingian), about 260–254 Ma in what is now South Africa and Tanzania.[1][2][3]

Gorgonopsians were an extinct clade of carnivorous therapsids that first appeared either during the Middle or (Early) Permian.[4] They were the first group of therapsids to evolve saber-like canines.[5] They were subordinate to dinocephalians and basal therocephalians during the Middle Permian,[6][7] with the exception of the Phorcyidae, which were the top predators of their localities.[8][9] Gorgonops would appear in the fossil record shortly after the primary phase of the Capitanian mass extinction.[10][11]

Classification

History of discovery

The holotype of the type species, Gorgonops torvus, was one of the first therapsids discovered. It was described by Richard Owen, who also coined the name "Dinosauria" on the basis of the first known dinosaur fossils.[12] G. torvus was also used as the type for the family Gorgonopsidae, which was described by Richard Lydekker in 1890.[13] Five years later, in 1895, Harry Govier Seeley used this genus to establish the larger clade of Gorgonopsia.[14] In later years, a large number of further species and genera were designated, though many of these were later determined to be synonyms. Gorgonops is known from the Endothiodon and most of the Cistecephalus Assemblage Zones.[2]

Species

Gorgonops torvus (Owen, 1876)

Life reconstruction of G. torvus

The type species. The holotype is an incomplete and flattened skull, allegedly found at Mildenhall's farm (Xlu Xlu), on the Queen's Road south of Fort Beaufort, in the Eastern Cape of South Africa. A number of other specimens have been found since, all from the Tropidostoma and/or Cistecephalus Assemblage Zone(s). This was a medium-sized therapsid, with a skull about 22 cm in length. It is distinguished from other species by a longer snout, and other details of the bones of the skull. Originally considered rather simple, it is actually (according to Sigogneau-Russell) a rather specialised member of the group.[15]

Gorgonops whaitsi (Broom, 1912)

Head of G. whaitsi

Larger than G. torvus, with the rear of the skull wider, and other details of proportion. Originally the type species of Scymnognathus. Despite being known from a large number of specimens from the Karoo Basin, Beaufort West (Tropidostoma/Cistecephalus Assemblage Zone), the species remains poorly known. Watson and Romer placed Gorgonops and Scymnognathus in two different families, while Sigogneau-Russell placed the two species in the same genus, and considers G. whaitsi a more primitive (less derived) form.[15] Synonyms: Scymnognathus whaitsi (Broom, 1912)

Gorgonops longifrons (Haughton, 1915)

A large specimen known from an incomplete and flattened skull about 35 centimetres (14 in) long. Orbit larger and snout longer than G. whaitsi, from which it may have descended. Beaufort West, Tropidostoma/Cistecephalus Assemblage Zone. Synonyms: Gorgonognathus longifrons (Haughton, 1915)

Gorgonops? eupachygnathus (Watson, 1921)

Synonyms: Leptotrachelus eupachygnathus (Watson, 1921); Leptotracheliscops eupachygnathus (Watson, 1921)

Gorgonops? dixeyi (Haughton, 1926)

A large, incomplete and flattened skull, from Chiweta Beds, Nyassaland. Placement uncertain. Probably Low Cistecephalus Assemblage Zone equivalent (= middle of the Wuchiapingian Stage).[16] Synonyms: Chiwetasaurus dixeyi (Haughton, 1926)

Gorgonops? kaiseri (Broili & Schroeder, 1934)

A large (about 35 centimetres (14 in) long), incomplete skull, with a high snout and narrower in the rear than other species, from the "High Tapinocephalus zone" (earlier than the other species, most probably Pristerognathus Assemblage Zone) Synonyms: Pachyrhinos kaiseri (Broili & Schroeder, 1934)

Taxonomy

Below is a cladogram from Gebauer's 2007 phylogenetic analysis.[17]

Gorgonopsia
 

Aloposaurus

 
 
 

Cyonosaurus

 
 
 

Aelurosaurus

 
Gorgonopsidae
 

Scylacognathus

 
 
 

Eoarctops

 
 

Gorgonops

 
 
 

Njalila

 
 
 

Lycaenops

 
 
 

Arctognathus

 
 
 

Inostrancevia

 
Rubidgeinae
 

Aelurognathus

 
 
 

Rubidgea

 
 
 

Sycosaurus

 
 

Clelandina

 
 
 
 
 
 
 
 
 
 
 
 
 

Phylogenetic modeling by Gorgonops to Kammerer and Masyutin (2018) and onwards recovered Gorgonops as a member of the African clade, a clade of gorgonopsians that consisted of almost all African gorgonopsians with the exception of Inostrancevia africana.[18][19][20] Cladogram recovered by Macungo et al. (2026):[19]

Gorgonopsia 
 

Nochnitsa

 
 
 

Viatkogorgon

 
 
"Russian clade"
 

Suchogorgon

 
 
 

Sauroctonus

 
 
 

Pravoslavlevia

 
 

Inostrancevia

 
 
 
 
"African clade"
 
 

Eriphostoma

 
 
 

Gorgonops

 
 
 

Jirahgorgon

 
 

Phorcys

 
 
 
 
 
 

Cynariops

 
 
 

Lycaenops

 
 
 
 

Arctops

 
 
 

DA21/17-01-01
(Port des Canonge Fm. gorgonopsian[4])

 
 

Smilesaurus

 
 
 
 
 

Arctognathus

 
 

Rubidgeinae

 
 
 
 
 
 
 
 
 

Evolution

The oldest definitive gorgonopsian was recovered from the Mediterranean island of Mallorca, and which probably dates to the earliest Wordian of the Middle Permian. However, stratigraphic position of the gorgonopsian, as well as surrounding fossil track record may suggest it is significantly older, potentially Roadian stage of the Middle Permian. With a possibility of dating to the Kungurian or Artinskian stages of the Early Permian.[4] Gorgonopsians were the first group of therapsids to evolve sabertooth canines, before the appearance of dinosaurs or mammals.[5] During the Middle Permian, gorgonopsians were subordinate to basal therocephalians, another group of sabertooth therapsids, and dinocephalians.[6][7] However, Phorcyidae were an exception as they were likely being the apex predators of their locality.[8][9] Following the extinction of dinocephalians and basal therocephalians, gorgonopsians would become the dominant predators of the Late Permian.[21][22][6][23]

Description

G. whaitsi compared to a human.

Gorgonops was a medium-sized gorgonopsian, with a skull length of 22–35 centimetres (8.7–13.8 in), depending on the species. They ranged from 1.2–2 metres (3.9–6.6 ft) long from nose to tail. Bendel et al. (2023) estimated SAM-PK-K10591, a specimen of G. torvus, had a body mass between 72.9–145.6 kg (161–321 lb), with the mean body mass being 98.1 kg (216 lb). Although, the authors noted there currently isn't no mass regression based Gorgonopsia postcranial.[24] Kulik (2025) suggested a significantly smaller size for the same specimen, weighing 22.8 kg (50 lb), ranging from 17.1–28.5 kg (38–63 lb).[25]

Skull

Relative to body size, Gorgonops had a deep skull with a triangular profile when viewed from above. Perhaps the most distinctive features were two enlarged canine teeth that were so big (12 centimetres (4.7 in) long) they almost protruded beyond the lower jaw. To help protect these teeth, the lower jaws grew in such a shape so that the anterior (front) portion was thicker than the posterior (rear) portion. This form would have protected the enlarged canine teeth from accidental damage, and was similar in bone function to the flanges of bone of sabre-toothed cats in the Cenozoic.

Paleobiology

Biomechanical analysis of various sabertooth predators by Lautenschlager et al. (2020) found G. torvus had a maximum jaw gap of 68.11° and an effective jaw gape of 48°. The authors concluded due to the actual jaw gapes were below 80° and effective jaw gape below 60°, gorgonopsians were likely specialized on prey either smaller or similar in size. Their model size estimates that G. torvus had a bite force of 116 newtons.[26]

See also

References

  1. ↑ Sidor, C. A.; Angielczyk, K. D.; Weide †, D. M.; Smith, R. M. H.; Nesbitt, S. J.; Tsuji, L. A. (2010). "Tetrapod fauna of the lowermost Usili Formation (Songea Group, Ruhuhu Basin) of southern Tanzania, with a new burnetiid record". Journal of Vertebrate Paleontology 30 (3): 696–703. doi:10.1080/02724631003758086. Bibcode: 2010JVPal..30..696S. http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1379&context=geosciencefacpub. 
  2. ↑ 2.0 2.1 Smith, R.H.M.; Keyser, A.W. (1995). "Biostratigraphy of the Tropidostoma Assemblage Zone". Geological Survey of South Africa 1: 18–22. 
  3. ↑ Viglietti, Pia A. (2020). "Biostratigraphy of the Daptocephalus Assemblage Zone (Beaufort Group, Karoo Supergroup), South Africa". South African Journal of Geology 123 (2): 191–206. doi:10.25131/sajg.123.0014. Bibcode: 2020SAJG..123..191V. https://www.researchgate.net/publication/342445283. 
  4. ↑ 4.0 4.1 4.2 Matamales-Andreu, Rafel; Kammerer, Christian F.; Angielczyk, Kenneth D.; Simões, Tiago R.; Mujal, Eudald; Galobart, Àngel; Fortuny, Josep (2024). "Early–middle Permian Mediterranean gorgonopsian suggests an equatorial origin of therapsids" (in en). Nature Communications 15 (1): 10346. doi:10.1038/s41467-024-54425-5. ISSN 2041-1723. PMID 39690157. Bibcode: 2024NatCo..1510346M. 
  5. ↑ 5.0 5.1 Antón, Mauricio (2013). Sabertooth. Bloomington, Indiana: University of Indiana Press. pp. 3–26. ISBN 978-0-253-01042-1. https://archive.org/details/Sabertooth. 
  6. ↑ 6.0 6.1 6.2 Kammerer, Christian F.; Smith, Roger M. H.; Day, Michael O.; Rubidge, Bruce S. (2015). "New information on the morphology and stratigraphic range of the mid-Permian gorgonopsian Eriphostoma microdon Broom, 1911". Papers in Paleontology 1 (2): 201–221. doi:10.1002/spp2.1012. Bibcode: 2015PPal....1..201K. https://onlinelibrary.wiley.com/doi/abs/10.1002/spp2.1012. 
  7. ↑ 7.0 7.1 Day, Michael O.; Ramezani, Jahandar; Bowring, Samuel A.; Sadler, Peter M.; Erwin, Douglas H.; Abdala, Fernando; Rubidge, Bruce S. (2015). "When and how did the terrestrial mid-Permian mass extinction occur? Evidence from the tetrapod record of the Karoo Basin, South Africa". Proceedings of the Royal Society B 282 (1811). doi:10.1098/rspb.2015.0834. PMID 26156768. Bibcode: 2015RSPSB.28250834D. 
  8. ↑ 8.0 8.1 Kammerer, Christian F.; Rubidge, Bruce S. (2022). "The earliest gorgonopsians from the Karoo Basin of South Africa". Journal of African Earth Sciences 194. doi:10.1016/j.jafrearsci.2022.104631. Bibcode: 2022JAfES.19404631K. 
  9. ↑ 9.0 9.1 Macungo, Zanildo; Araújo, Ricardo; Rubidge, Bruce S.; Day, Michael O.; Dollman, Kathleen N.; Benoit, Julien (2026). "Evolutionary radiation of large-bodied gorgonopsians from the lower Abrahamskraal formation of South Africa" (in en). The Anatomical Record. doi:10.1002/ar.70181. ISSN 1932-8486. PMID 41819826. 
  10. ↑ Day, M. O.; Smith, R. M. H. (2020). "Biostratigraphy of the Endothiodon Assemblage Zone (Beaufort Group, Karoo Supergroup), South Africa". South African Journal of Geology 123 (2): 165–180. doi:10.25131/sajg.123.0011. Bibcode: 2020SAJG..123..165D. https://www.researchgate.net/publication/342445549. 
  11. ↑ Day, M. O.; Rubidge, B. S. (2021). "The Late Capitanian Mass Extinction of Terrestrial Vertebrates in the Karoo Basin of South Africa". Frontiers in Earth Science 9: 15. doi:10.3389/feart.2021.631198. Bibcode: 2021FrEaS...9...15D. 
  12. ↑ Owen, R. (1876). Descriptive and illustrated catalogue of the fossil Reptilia of South Africa in the collection of the British museum. British Museum (Natural History). pp. 27–29. https://babel.hathitrust.org/cgi/pt?id=mdp.39015009238919&view=1up&seq=43. 
  13. ↑ Lydekker, R. (1890). Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) Part IV. British Museum (Natural History). p. 111. https://www.biodiversitylibrary.org/item/125712#page/141/mode/1up. 
  14. ↑ Seeley, H. G. (1895). "Researches on the structure, organization, and classification of the fossil reptilia.—Part IX. section 1. On the Therosuchia". Annals and Magazine of Natural History 13 (6): 375. doi:10.1080/00222939408677718. https://zenodo.org/record/2292163. 
  15. ↑ 15.0 15.1 Sigogneau-Russell, D. (1989). "Theriodontia I". in H.-D., Sues. Encyclopedia of Paleoherpetology. Gustav-Fischer-Verlag. ISBN 978-3-89937-033-1. https://pfeil-verlag.de/en/publications/handbuch-der-palaeoherpetologie-encyclopedia-of-paleoherpetology-part-17b1-theriodontia-i/. 
  16. ↑ Jacobs, L.L.; Winkler, D.A.; Newman, K.D.; Gomani, E.M.; Deino, A. (2005). "Therapsids from the Permian Chiweta Beds and the age of the Karoo Supergroup in Malawi". Palaeontologia Electronica 8 (1): 28A. http://palaeo-electronica.org/2005_1/jacobs28/issue1_05.htm. 
  17. ↑ Gebauer, E.V.I. (2007). Phylogeny and evolution of the Gorgonopsia with a special reference to the skull and skeleton of GPIT/RE/7113 ('Aelurognathus?' parringtoni) (PDF) (Ph.D. thesis). Tübingen: Eberhard-Karls Universität Tübingen. pp. 1–316. Archived from the original (PDF) on 2012-07-22. Retrieved 2014-07-13.
  18. ↑ Kammerer, Christian F.; Masyutin, Vladimir (2018). "Gorgonopsian therapsids (Nochnitsa gen. nov. and Viatkogorgon) from the Permian Kotelnich locality of Russia". PeerJ 6. doi:10.7717/peerj.4954. PMID 29900078. 
  19. ↑ 19.0 19.1 Macungo, Zanildo; Araújo, Ricardo; Rubidge, Bruce S.; Day, Michael O.; Dollman, Kathleen N.; Benoit, Julien (2026). "Evolutionary radiation of large-bodied gorgonopsians from the lower Abrahamskraal formation of South Africa" (in en). The Anatomical Record. doi:10.1002/ar.70181. ISSN 1932-8486. PMID 41819826. 
  20. ↑ Mann, Arjan; Sidor, Christian A. (2025-08-07). "Arctops umulunshi, sp. nov. (Therapsida: Gorgonopsia) from the upper Madumabisa Mudstone Formation of Zambia, with new information on gorgonopsian postcranial anatomy" (in en). Journal of Vertebrate Paleontology 45 (sup1). doi:10.1080/02724634.2024.2444405. ISSN 0272-4634. 
  21. ↑ Bendel, Eva-Maria; Kammerer, Christian F.; Kardjilov, Nikolay; Fernandez, Vincent; Fröbisch, Jörg (2018). "Cranial anatomy of the gorgonopsian Cynariops robustus based on CT-reconstruction". PLOS ONE 13 (11). doi:10.1371/journal.pone.0207367. PMID 30485338. Bibcode: 2018PLoSO..1307367B. 
  22. ↑ Kammerer, Christian F.; Masyutin, Vladimir (2018). "Gorgonopsian therapsids (Nochnitsa gen. nov. and Viatkogorgon) from the Permian Kotelnich locality of Russia". PeerJ 6. doi:10.7717/peerj.4954. PMID 29900078. 
  23. ↑ Kammerer, CF; Masyutin, V. (2018). "A new therocephalian (Gorynychus masyutinae gen. et sp. nov.) from the Permian Kotelnich locality, Kirov Region, Russia". PeerJ 6. doi:10.7717/peerj.4933. PMID 29900076. 
  24. ↑ Bendel, Eva-Maria; Kammerer, Christian F.; Smith, Roger M. H.; Fröbisch, Jörg (2023). "The postcranial anatomy of Gorgonops torvus (Synapsida, Gorgonopsia) from the late Permian of South Africa". PeerJ 11. doi:10.7717/peerj.15378. PMID 37434869. 
  25. ↑ Kulik, Zoe T. (2025). "Bone histology of a gorgonopsian skeleton from the upper Madumabisa Mudstone Formation, Zambia". Journal of Vertebrate Paleontology 45. doi:10.1080/02724634.2025.2490799. https://www.tandfonline.com/doi/full/10.1080/02724634.2025.2490799. 
  26. ↑ Lautenschlager, Stephan; Figueirido, Borja; Cashmore, Daniel D.; Bendel, Eva-Maria; Stubbs, Thomas L. (2020). "Morphological convergence obscures functional diversity in sabre-toothed carnivores". Proceedings of the Royal Society B 287 (1935): 1–10. doi:10.1098/rspb.2020.1818. ISSN 1471-2954. PMID 32993469. 

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