Calodiscus

Calodiscus; Temporal range:
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Trilobita (?)
Order:	†Agnostida
Family:	†Calodiscidae
Genus:	†Calodiscus; Howell, 1935 [1]
Species
	†Calodiscus lobatus Hall, 1847 – Type species; †Calodiscus foveolatus Howell, 1935; †Calodiscus lunulatus (Kobayashi, 1943) [=Brevidiscus lunulatus Kobayashi, 1943]; †Calodiscus tianshanicus Xiang & Zhang, 1985 [=C. xinjiangensis Xiang & Zhang, 1985] [2];
Synonyms
	Goniodiscus Raymond, 1913 ; Brevidiscus Kobayashi, 1943;

Calodiscus is a genus of Eodiscinid trilobite in the family Calodiscidae.[3] It lived during the late Lower Cambrian, with remains found in Canada (Newfoundland & Labrador), the United States (Massachusetts, New York State), Greenland, The United Kingdom (England), Sweden, France, Germany, Italy (Sardinia), Kazakhstan, the Russian Federation and China.

The type species by original designation is Agnostus lobatus Hall, 1847 from the upper part of the lower Cambrian Browns Pond Formation (formerly Schodack Formation) at Troy in the Taconic region of New York State, USA [= Calodiscus korolevi Pokrovskaya in Ergaliev and Pokrovskaya, 1977; Calodiscus lakei Rasetti, 1952; and Calodiscus n. sp. A of Geyer, 1988, according to Cederström et al., 1988].[4][5]

Lochman (1956)[6] demonstrated that Calodiscus agnostoides (Kobayashi, 1943) represents late meraspid instars of C. lobatus (Cederström et al., 1988, p. 500).

References

HOWELL, B. F. 1935. Cambrian and Ordovician trilobites from Herault, southern France. Journal of Paleontology 9(3): 222 - 238
XIANG, L. W. & ZHANG, T. R. 1985. Systematic description of the trilobites. In Stratigraphy and Trilobite Faunas of the Cambrian in the Western Part of Northern Tianshan, Xinjiang (Wang, J. B. et al., eds), Ministry of Geology and Mineral Resources, Geological Memoirs, Series 2, 4, 64 - 165. Geological Publishing House, Beijing [in Chinese, with English summary].
KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.
HALL, J. 1847. Palaeontology: Volume 1. Containing descriptions of the organic remains of the lower division of the New-York System. Natural history of New York, Albany. 338 pp.
CEDERSTRÖM, P., AHLBERG, P., CLARKSON, E. N. K., NILSSON, C. H. and AXHEIMER, N. 1988. The Lower Cambrian eodiscoid trilobite Calodiscus lobatus from Sweden: Morphology, ontogeny and distribution. Palaeontology, Vol. 52, Part 3, 2009, pp. 491 – 53.
LOCHMAN, C. 1956. Stratigraphy, paleontology, and paleogeography of the Elliptocephala asaphoides strata in Cambridge and Hoosick Quadrangles, New York. Bulletin of the Geological Society of America, 67, 1331 – 1396.

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[1] HOWELL, B. F. 1935. Cambrian and Ordovician trilobites from Herault, southern France. Journal of Paleontology 9(3): 222 - 238

[2] XIANG, L. W. & ZHANG, T. R. 1985. Systematic description of the trilobites. In Stratigraphy and Trilobite Faunas of the Cambrian in the Western Part of Northern Tianshan, Xinjiang (Wang, J. B. et al., eds), Ministry of Geology and Mineral Resources, Geological Memoirs, Series 2, 4, 64 - 165. Geological Publishing House, Beijing [in Chinese, with English summary].

[3] KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.

[4] HALL, J. 1847. Palaeontology: Volume 1. Containing descriptions of the organic remains of the lower division of the New-York System. Natural history of New York, Albany. 338 pp.

[5] CEDERSTRÖM, P., AHLBERG, P., CLARKSON, E. N. K., NILSSON, C. H. and AXHEIMER, N. 1988. The Lower Cambrian eodiscoid trilobite Calodiscus lobatus from Sweden: Morphology, ontogeny and distribution. Palaeontology, Vol. 52, Part 3, 2009, pp. 491 – 53.

[6] LOCHMAN, C. 1956. Stratigraphy, paleontology, and paleogeography of the Elliptocephala asaphoides strata in Cambridge and Hoosick Quadrangles, New York. Bulletin of the Geological Society of America, 67, 1331 – 1396.