// Workers AI · dad joke modeWhat did Cosmacanthus say? Nothing, it's a star-fish.

Cosmacanthus; Temporal range: Late Devonian, 360.7–358.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Fossil of Cosmacanthus semistiatus - picture taken at Natural History Museum, Bonn University
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Placodermi
Order:	†Arthrodira
Family:	†Groenlandaspididae
Genus:	†Cosmacanthus; Agassiz, 1845
Species
	†C. bullatus (Saint John & Worthen, 1875) Hay, 1902; †C. carinatus Davis, 1883; †C. malcolmsoni (Agassiz, 1844); †C. marginalis Davis, 1883; †C. priscus (Mcoy, 1848); †C. sellatus (Saint John & Worthen, 1875 (Hay, 1902); †C. semistriatus;
Synonyms
	Geisacanthus bullatus Satint John & Worthen, 1875; Geisacanthus stellatus Satint John & Worthen, 1875;

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.^[1] It was named by Louis Agassiz in 1845.^[2]

†Cosmacanthus elegans, a synonym for †Nemacanthus elegans Evans, 1904 (elasmobranch)

References

↑ O. P. Hay. 1902. Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868
↑ Monographie des poissons fossiles du vieux grés rouge: ou système Dévonien (Old red sandstone) des Iles Britanniques et de Russie. L Agassiz, 1845

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