Cosmacanthus is an extinct genus of placoderms in the extinct family Groenlandaspididae that lived during the Late Devonian in Ireland, the UK, Russia and North America.O. P. Hay. 1902. Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868 It was named by Louis Agassiz in 1845.Monographie des poissons fossiles du vieux grés rouge: ou système Dévonien (Old red sandstone) des Iles Britanniques et de Russie. L Agassiz, 1845
Names brought to synonymy †Cosmacanthus elegans, a synonym for †Nemacanthus elegans Evans, 1904 (elasmobranch)
See also List of placoderm genera
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