Acondylacanthus is an extinct genus of ctenacanthiform from the Paleozoic era. The type species is A. gracilis.[1] Most species are known from the Carboniferous of America and the British isles. A. jaekeli is known from the upper Frasnian of Germany and the Upper Famennian of Russia. This genus is based entirely upon isolated dorsal fin spines, and thus may later be found synonymous with tooth-based genera.[2] Many species have been ascribed to this genus, though there has been some confusion with Ctenachanthus. This genus is in need of review and research.[3]
| Acondylacanthus Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | †Ctenacanthiformes |
| Family: | †Ctenacanthidae |
| Genus: | †Acondylacanthus St. John & Worthen, 1875 |
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References
edit- ^ Itano, Wayne M.; Houck, Karen J.; Lockley, Martin G. (May 2003). "Ctenacanthus and other chondrichthyan spines and denticles from the Minturn Formation (Pennsylvanian) of Colorado". Journal of Paleontology. 77 (3): 524–535. doi:10.1017/s002233600004422x. ISSN 0022-3360. S2CID 232346186.
- ^ Lebedev, Oleg (Jan 1995). "Middle Famennian (Upper Devonian)Chondrichthyans and Sarcopterygians from Oryol region; Central Russia". Geobios. 28: 361–368. doi:10.1016/s0016-6995(95)80139-1. ISSN 0016-6995.
- ^ "Fossilworks: Acondylacanthus". fossilworks.org. Retrieved 17 December 2021.
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