Campyloprion

Campyloprion; Temporal range: Gzhelian, 303.4–298.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	† Eugeneodontiformes
Family:	† Helicoprionidae
Genus:	† Campyloprion ; Eastman, 1902
Species
	†C. annectans;

Last updated November 16, 2025

Campyloprion is a dubious extinct genus of large shark-like eugenodont fish. Only the species Campyloprionannectans from Texas and New Mexico is recognized, and the former species "C." ivanovi from Russia is now assigned to the genus Karpinskiprion .^[1]C. annectans lived during the Gzhelian stage of the Carboniferous period, approximately 303.4–298.9 million years ago.^[2] There is a small gap in age between the latest Edestus and the first Campyloprion, which suggests that Campyloprion might have evolved to fit into an ecological niche left vacant by the extinction of Edestus. The fact that Campyloprion is older than Helicoprion suggests, but does not prove, that it is a direct ancestor of Helicoprion.^[3]

Description

Campyloprion teeth resemble those of Helicoprion, but the tooth whorl has an open spiral shape, more loosely coiled than that of Helicoprion.^[3]

References

↑ Lebedev, Oleg A.; Itano, Wayne M.; Johanson, Zerina; Alekseev, Alexander S.; Smith, Moya M.; Ivanov, Aleksey V.; Novikov, Igor V. (2022). "Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 113 (4): 337–360. doi:10.1017/S1755691022000251. ISSN 1755-6910.
↑ "†Campyloprion Eastman 1902 (chimaera)". fossilworks.org. Retrieved 27 August 2023.
1 2 Itano, Wayne. "Campyloprion, a little-known Helicoprion-like shark: The story behind the article". researchgate.net. Retrieved 27 August 2023.

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[:02-1] Lebedev, Oleg A.; Itano, Wayne M.; Johanson, Zerina; Alekseev, Alexander S.; Smith, Moya M.; Ivanov, Aleksey V.; Novikov, Igor V. (2022). "Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 113 (4): 337–360. doi:10.1017/S1755691022000251. ISSN 1755-6910.

[:0-2] "†Campyloprion Eastman 1902 (chimaera)". fossilworks.org. Retrieved 27 August 2023.

[:1-3] 1 2 Itano, Wayne. "Campyloprion, a little-known Helicoprion-like shark: The story behind the article". researchgate.net. Retrieved 27 August 2023.

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