Cosmacanthus

Extinct genus of 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
Domain:	Eukaryota
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

see Gnathostomata
Placodermi	see below↓

Placodermi

Acanthothoraci *

Hagiangella
Palaeacanthaspidae*	Arabosteus Dobrowlania Kimaspis Kolymaspis Kosoraspis Palaeacanthaspis Radotina Romundina Sudaspis Tlamaspis
Weejasperaspididae	Murrindalaspis Weejasperaspis

Diandongpetalichthys Neopetalichthys
Quasipetalichthyidae	Eurycaraspis Pauropetalichthys Quasipetalichthys
Macropetalichthyidae	Ellopetalichthys Epipetalichthys Lunaspis Macropetalichthys Notopetalichthys Shearsbyaspis Tongdzuylepis Wijdeaspis