Cosmoptychius

Cosmoptychius is an extinct genus of freshwater and estuarine ray-finned fish that lived during the Mississippian epoch.^[1][2] It contains a single species, C. striatus from the Visean of Scotland.^[3] It has a wide stratigraphic range in the Wardie Shale, with many specimens known.^[4][5]

Cosmoptychius Temporal range: Viséan[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Family:	†Cosmoptychiidae Gardiner, 1963
Genus:	†Cosmoptychius Traquair, 1877
Species:	†C. striatus
Binomial name
†Cosmoptychius striatus (Agassiz, 1835)
Synonyms
†Amblypterus striatus Agassiz, 1835 †Cosmoptygius Traquair, 1877 (misspelling)

Initially classified as either a palaeonisciform (a now-paraphyletic group of basal actinopterygians)^[6] or the earliest stem-group neopterygian, it is now generally considered a stem-group actinopteran.^[7]