Article · Wikipedia archive · Last revised Jul 19, 2026

Cosmacanthus

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. It was named by Louis Agassiz in 1845.Names brought to synonymy†Cosmacanthus elegans, a synonym for †Nemacanthus elegans Evans, 1904 (elasmobranch)

Last revised
Jul 19, 2026
Read time
≈ 1 min
Length
196 w
Citations
2
Source
Wikipedia ↗
Cosmacanthus
Temporal range: Late Devonian,
Fossil of Cosmacanthus semistiatus - picture taken at Natural History Museum, Bonn University
Scientific classification Edit this 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

Names brought to synonymy
See also

See also

References

References

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