Biology:Parvodus

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Parvodus is an extinct genus of hybodont, known from the Mesozoic era.

Species

The initial study naming the genus considered 3 species valid, which were originally placed in Lissodus.[1]

  • P. curvidens (Duffin and Thies, 1997), Kimmeridgian, Germany
  • P. ominechonensis Breeden et al., 2024, Carnian, Japan
  • P. pattersoni (Duffin, 1985), Bathonian, England and Scotland
  • P. rugianus (Ansorge, 1990) Berriasian-Valanginian, England, Germany, Denmark and Sweden
  • P. graciliani Ribeiro et al., 2026, Tithonian, Brazil.

The paper also noted a possible record is known from the Sinemurian of England.[1]

Some later studies also included the species Parvodus heterodon (Patterson, 1966) from the Early Cretaceous of England in the genus,[2] though other studies have included this species in the genus Polyacrodus.[3] Some studies have also included the species "Hybodus" parvidens Woodward, 1916, from the Early Cretaceous of Europe and North America within Parvodus,[4] though again this species has also been assigned to Polyacrodus.[3][5] A 2023 paper assigned the newly described species P. huizodus from the Early Triassic of China to the genus.[4] The species Parvodus celsucuspus Rees et al., 2013 has been reported from the Early Cretaceous of England and France.[6][7] A single tooth of Parvodus sp. has also been reported from the Upper Cretaceous (Campanian) of France.[8]

In 2026, a new species of Parvodus was published: P. graciliani, honoring the Brazilian writer Graciliano Ramos (1892–1953), author of the novel Vidas Secas. This new species was described based on isolated teeth recovered from lacustrine deposits of the Aliança Formation in the Jatobá Basin and represents the first formally named species of the genus from this unit.[9]

References

  1. ↑ 1.0 1.1 Rees, Jan; Underwood, Charlie J. (2002-09-19). "The status of the shark genus Lissodus Brough, 1935, and the position of nominal Lissodus species within the Hybodontoidea (Selachii)" (in en). Journal of Vertebrate Paleontology 22 (3): 471–479. doi:10.1671/0272-4634(2002)022[0471:TSOTSG2.0.CO;2]. ISSN 0272-4634. http://www.tandfonline.com/doi/abs/10.1671/0272-4634%282002%29022%5B0471%3ATSOTSG%5D2.0.CO%3B2. 
  2. ↑ Sweetman, Steven C.; Goedert, Jean; Martill, David M. (November 2014). "A preliminary account of the fishes of the Lower Cretaceous Wessex Formation (Wealden Group, Barremian) of the Isle of Wight, southern England: Wealden Group fishes" (in en). Biological Journal of the Linnean Society 113 (3): 872–896. doi:10.1111/bij.12369. https://academic.oup.com/biolinnean/article-lookup/doi/10.1111/bij.12369. 
  3. ↑ 3.0 3.1 Underwood, Charlie J. and Rees, J. (2002) Selachian faunas from the earliest Cretaceous Purbeck Group of Dorset, southern England. Special Papers in Palaeontology 68, pp. 107-19. ISSN 0038-6804.
  4. ↑ 4.0 4.1 Wen, Wen; Kriwet, JüRgen; Zhang, Qiyue; Benton, Michael J.; Duffin, Christopher J.; Huang, Jingyuan; Zhou, Changyong; Hu, Shixue et al. (2022-06-30). "Hybodontiform shark remains (Chondrichthyes, Elasmobranchii) from the Lower Triassic of Yunnan Province, China, with comments on hybodontiform diversity across the PTB" (in en). Journal of Vertebrate Paleontology 42 (1). doi:10.1080/02724634.2022.2108712. ISSN 0272-4634. Bibcode: 2022JVPal..42E8712W. https://www.tandfonline.com/doi/full/10.1080/02724634.2022.2108712. 
  5. ↑ Turmine-Juhel, Pernelle; Wilks, Richard; Brockhurst, David; Austen, Peter A.; Duffin, Christopher J.; Benton, Michael J. (December 2019). "Microvertebrates from the Wadhurst Clay Formation (Lower Cretaceous) of Ashdown Brickworks, East Sussex, UK" (in en). Proceedings of the Geologists' Association 130 (6): 752–769. doi:10.1016/j.pgeola.2019.08.003. Bibcode: 2019PrGA..130..752T. https://linkinghub.elsevier.com/retrieve/pii/S0016787819300732. 
  6. ↑ Rees, Jan; Cuny, Gilles; Pouech, Joane; Mazin, Jean-Michel (August 2013). "Non-marine selachians from the basal Cretaceous of Charente, SW France" (in en). Cretaceous Research 44: 122–131. doi:10.1016/j.cretres.2013.04.002. Bibcode: 2013CrRes..44..122R. https://linkinghub.elsevier.com/retrieve/pii/S019566711300061X. 
  7. ↑ Penn, Simon J.; Sweetman, Steven C. (March 2023). "Microvertebrate-rich gutter casts from the basal Wessex Formation (Wealden Group, Lower Cretaceous) of Dungy Head, Dorset: Insights into the palaeoecology and palaeoenvironment of a non-marine wetland" (in en). Cretaceous Research 143. doi:10.1016/j.cretres.2022.105397. Bibcode: 2023CrRes.14305397P. https://linkinghub.elsevier.com/retrieve/pii/S0195667122002610. 
  8. ↑ Valentin, Xavier; Vullo, Romain; Cuny, Gilles; Jansen, Olivier; Garcia, Géraldine (January 2026). "Hybodont shark remains from Campanian (Upper Cretaceous) continental deposits of southern France" (in en). Cretaceous Research 177. doi:10.1016/j.cretres.2025.106205. https://linkinghub.elsevier.com/retrieve/pii/S0195667125001284. 
  9. ↑ de Souza Ribeiro, Larissa; de França, Marco Aurélio Gallo. "A new species of Lonchidiidae (Hybodontiformes) from the Late Jurassic of Brazil (Aliança Formation, Jatobá Basin)". The Anatomical Record. doi:10.1002/ar.70120. 

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