Cycloptychius


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. It was a member of the Rhadinichthyidae, a family of basal ray-finned fish that was formerly placed in the now-paraphyletic order Palaeonisciformes.
It contains the following species:C. bidens Matveeva, 1958 - Early Carboniferous of Krasnoyarsk Krai, Russia C. carbonarius Young, 1866 - Late Carboniferous of England C. concentricus Traquair, 1881 - Early Carboniferous of Scotland