CYCLOPTYCHIUS

Cycloptychius; Temporal range: Tournaisian– Moscovian PreꞒ Ꞓ O S D C P T J K Pg N Possible Artinskian occurrence
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Family:	† Rhadinichthyidae
Genus:	† Cycloptychius; Young, 1866
Species
	†C. bidens Matveeva, 1958; †C. carbonarius Young, 1866; †C. concentricus Traquair, 1881; ? †C. loocki Evans, 2005;

Cycloptychius is an extinct genus of prehistoric freshwater & marine ray-finned fish that existed throughout much of the Carboniferous period in Eurasia, and possibly into the Early Permian in South Africa.^[2]^[1] It was a member of the Rhadinichthyidae, a family of basal ray-finned fish that was formerly placed in the now- paraphyletic order Palaeonisciformes.^[3]^[4]

It contains the following species:^[5]

†C. bidens Matveeva, 1958 - Early Carboniferous ( Tournaisian) of Krasnoyarsk Krai, Russia ( Os’kin Formation)
†C. carbonarius Young, 1866 - Late Carboniferous ( Moscovian) of England ( North Staffordshire Coalfield)
†C. concentricus Traquair, 1881 - Early Carboniferous ( Viséan) of Scotland ( Glencartholm Volcanic Beds)
? †C. loocki Evans, 2005 - Early Permian ( Artinskian) of South Africa ( Whitehill Formation)^[6]

References

^ ^a ^b Schultze, Hans-Peter; Mickle, Kathryn E.; Poplin, Cecile; Hilton, Eric J.; Grande, Lance (2021). Handbook of Paleoichthyology, 8A. Actinopterygii I. Palaeoniscimorpha, Stem Neopterygii, Chondrostei. München: Dr. Friedrich Pfeil. p. 299. ISBN 978-3-89937-272-4.
^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-07-18.
^ Lund, Richard; Poplin, Cécile (1997-09-04). "The rhadinichthyids (paleoniscoid actinopterygians) from the Bear Gulch Limestone of Montana (USA, Lower Carboniferous)". Journal of Vertebrate Paleontology. 17 (3): 466–486. doi: 10.1080/02724634.1997.10010996. ISSN 0272-4634.
^ Mickle, Kathryn E. (2012-05-31). Unraveling the Systematics of Palaeoniscoid Fishes--Lower Actinopterygians in Need of a Complete Phylogenetic Revision. University of Kansas ( dissertation). p. 488.
^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-07-18.
^ Evans, F. J. (Fiona Jocelyn) (2005). Taxonomy, palaeoecology and palaeobiogeography of some palaeozoic fish of Southern Gondwana (Thesis). Stellenbosch : Stellenbosch University.

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