Parvodus

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

Parvodus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	†Hybodontiformes
Family:	†Lonchidiidae
Genus:	†Parvodus Rees & Underwood, 2001
Type species
Lissodus rugianus Ansorge, 1990

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. pattersoni (Duffin, 1985), Bathonian, England and Scotland
• P. rugianus (Ansorge, 1990) Berriasian-Valanginian, England, Germany, Denmark and Sweden.

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]

References

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)". Journal of Vertebrate Paleontology. 22 (3): 471–479. doi:10.1671/0272-4634(2002)022[0471:TSOTSG]2.0.CO;2. ISSN 0272-4634. S2CID 13836075.
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". Biological Journal of the Linnean Society. 113 (3): 872–896. doi:10.1111/bij.12369.
3. 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. Wen, Wen; Kriwet, JüRgen; Zhang, Qiyue; Benton, Michael J.; Duffin, Christopher J.; Huang, Jingyuan; Zhou, Changyong; Hu, Shixue; Ma, Zhixin (2022-06-30). "Hybodontiform shark remains (Chondrichthyes, Elasmobranchii) from the Lower Triassic of Yunnan Province, China, with comments on hybodontiform diversity across the PTB". Journal of Vertebrate Paleontology. 42 (1). Bibcode:2022JVPal..42E8712W. doi:10.1080/02724634.2022.2108712. ISSN 0272-4634. S2CID 252136919.
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". Proceedings of the Geologists' Association. 130 (6): 752–769. Bibcode:2019PrGA..130..752T. doi:10.1016/j.pgeola.2019.08.003. S2CID 202904040.
6. Rees, Jan; Cuny, Gilles; Pouech, Joane; Mazin, Jean-Michel (August 2013). "Non-marine selachians from the basal Cretaceous of Charente, SW France". Cretaceous Research. 44: 122–131. Bibcode:2013CrRes..44..122R. doi:10.1016/j.cretres.2013.04.002.
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". Cretaceous Research. 143: 105397. Bibcode:2023CrRes.14305397P. doi:10.1016/j.cretres.2022.105397. S2CID 253401972.