Crassostrea is a genus of true oysters (family Ostreidae) containing some of the most important oysters used for food. Some species in the genus have been moved to the genus Magallana.

Temporal range: 145.5–0 Ma
Eastern oyster bed on Cockspur Island, Georgia, USA
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreida
Family: Ostreidae
Genus: Crassostrea
Sacco, 1897[1]

See text

  • Ostrea (Crassostrea) Dall, 1909


Extant speciesEdit

Extant species include:[2]

  • Crassostrea aequatorialis (d'Orbigny 1846)[2]
  • Crassostrea angulata (Lamarck 1819) – Portuguese oyster
  • Crassostrea brasiliana (Lamarck 1819)[2]
  • Crassostrea chilensis (Philippi 1845)
  • Crassostrea columbiensis (Hanley 1846)[2]
  • Crassostrea corteziensis (Hertlein 1951)
  • Crassostrea cuttackensis (Newton & Smith, 1912)
  • Crassostrea dianbaiensis (Xia, Wu, Xiao & Yu, 2014)
  • Crassostrea rhizophorae (Guilding 1828)[2]
  • Crassostrea sikamea (Amemiya 1928) – Kumamoto oyster
  • Crassostrea tulipa (Lamarck 1819) – mangrove oyster[2]
  • Crassostrea virginica (Gmelin 1791) – Eastern oyster[2]

Fossil speciesEdit

Crassostrea gigantissima (Finch, 1824) from the Eocene of Texas.
Crassostrea gigantissima (Finch, 1824) right valve interior (Eocene of Texas).

Fossil species include:[3]

  • Crassostrea alabamiensis (Lea 1833)
  • Crassostrea ashleyi (Hertlein 1943) (syn. Ostrea arnoldi)
  • Crassostrea cahobasensis (Pilsbry and Brown 1910)
  • Crassostrea contracta (Conrad 1865)
  • Crassostrea cucullaris (Lamarck 1819)
  • Crassostrea cuebana (Jung 1974)
  • Crassostrea elegans (Deshayes, 1832)[4] (syn. †Cubitostrea elegans Deshayes 1832 or Crassostrea (Cubitostrea) elegans)
  • Crassostrea gigantissima (Finch 1824) – Giant fossil oyster
  • Crassostrea gryphoides (Schlotheim 1813)
  • Crassostrea hatcheri (Ihering 1899)
  • Crassostrea ingens (Zittel 1864)
  • Crassostrea kawauchidensis (Tamura 1977)
  • Crassostrea patagonica (d'Orbigny 1842) (syn. Ostrea ferrarisi)
  • Crassostrea raincourti (Deshayes 1858)
  • Crassostrea titan (Conrad 1853) (syn. Ostrea prior, O. andersoni)
  • Crassostrea transitoria (Hupé 1854) (syn. Ostrea maxima)
  • Crassostrea wyomingensis[5]


The genome of Crassostrea gigas (now Magallana gigas) has been recently sequenced revealing an extensive set of genes that enable it to cope with environmental stresses.[6]


  1. ^ I Molluschi dei terreni terziari del Piemonte e della Liguria. F Sacco, 1897
  2. ^ a b c d e f g Taxon list for Crassostrea. World Register of Marine Species, accessed on 9 August 2017.
  3. ^ "†Crassostrea Sacco 1897". Paleobiology Database. Fossilworks. Retrieved 17 December 2021.
  4. ^ irmng
  5. ^ J. Haffty, R. G. Schmidt, L. B. Riley, W. D. Goss. Rocks and Mineral Resources of the Wolf Creek Area, Lewis and Clark and Cascade Counties, Montana: A Descriptive Report on an Area in the Disturbed Belt Along the Eastern Front of the Northern Rocky Mountains in Western Montana, Issues 1441-1446
  6. ^ Zhang, G.; Fang, X.; Guo, X.; Li, L.; Luo, R.; Xu, F.; Yang, P.; Zhang, L.; Wang, X.; Qi, H.; Xiong, Z.; Que, H.; Xie, Y.; Holland, P. W. H.; Paps, J.; Zhu, Y.; Wu, F.; Chen, Y.; Wang, J.; Peng, C.; Meng, J.; Yang, L.; Liu, J.; Wen, B.; Zhang, N.; Huang, Z.; Zhu, Q.; Feng, Y.; Mount, A.; Hedgecock, D. (2012). "The oyster genome reveals stress adaptation and complexity of shell formation". Nature. 490 (7418): 49–54. Bibcode:2012Natur.490...49Z. doi:10.1038/nature11413. PMID 22992520.