| Ctenacanthus Temporal range:
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| Dermal spine, National Museum of Natural History | |
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| Restoration of C. concinnus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | †Ctenacanthiformes |
| Family: | †Ctenacanthidae |
| Genus: | †Ctenacanthus Agassiz, 1837 |
| Type species | |
| Ctenacanthus major Agassiz, 1837
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| Species | |
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See text | |
Ctenacanthus (from Greek: κτείς kteis, 'comb' and Greek: ἄκανθα akantha, 'spine')[1] is an extinct genus of ctenacanthiform chondrichthyan. Remains have been found in the Bloyd Formation (Carboniferous Period) of Arkansas and the Cleveland Shale (Devonian Period) of Ohio in the United States and in South America.[2][3][4]
- ^ Roberts, George (1839). An etymological and explanatory dictionary of the terms and language of geology. London: Longman, Orme, Brown, Green, & Longmans. p. 38. Retrieved 29 December 2021.
- ^ Acanthodian fish remains from the Upper Silurian or Lower Devonian of the Amazon Basin, Brazil. Philippe Janvier, Jose Henrique G. Melo, Palaeontology, Aug 1988, Vol 31, part 3
- ^ Agassiz, Louis (1837). "De genre Ctenacanthus Agass". Contenant l'Histoire de l'Ordre de Placoïdes. Recherches sur les poissons fossiles. Vol. 3. Neuchâtel: Petitpierre. pp. 10–12.
- ^ "Ctenacanthus". paleobiodb.org. Retrieved 2023-04-25.