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Isognomon

Genus of bivalves From Wikipedia, the free encyclopedia

Isognomon
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(For the tree oyster mushroom, see Pleurotus ostreatus.)

Quick Facts Scientific classification, Type species ...
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Isognomon is a genus of marine bivalve mollusks which is related to the pearl oysters.[1]

Isognomon is known in the fossil record from the Permian period to the Quaternary period (age range: 254.0 to 0.012 million years ago). Fossils of species within this genus have been found all over the world.[2]

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Taxonomy

This genus is placed in the family Isognomonidae. However previous molecular phylogeny studies have shown that these tree oysters belong in the family Pteriidae.[3][4]

Description

These oysters grow to be about 4.75 inches (12.1 cm) in overall length, producing a highly irregular shell with a blue-gray and often heavily encrusted exterior but a smooth and pearly white interior. They use their byssus to completely immobilize themselves to the roots of mangrove trees, corals, and other substrates.[5] It is because of the preference for mangroves that these are sometimes called tree oysters[6]

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Species

  • Isognomon alatus (Gmelin, 1791) Flat tree-oyster
  • Isognomon albisoror (Iredale, 1939)
  • Isognomon australica (Reeve, 1858)
  • Isognomon bicolor (C.B. Adams, 1845)
  • Isognomon californicus (Conrad, 1837)
  • Isognomon dunkeri (P. Fischer, 1881)
  • Isognomon ephippium (Linnaeus, 1758)
  • Isognomon fortissimus (L. C. King, 1933)
  • Isognomon incisum (Conrad, 1837)
  • Isognomon isognomum (Linnaeus, 1758)
  • Isognomon janus Carpenter, 1857
  • Isognomon legumen (Gmelin, 1791)
  • Isognomon nucleus (Lamarck, 1819)
  • Isognomon perna (Linnaeus, 1767)
  • Isognomon radiatus (Anton, 1838) Lister's tree oyster
  • Isognomon recognitus (Mabille, 1895)
  • Isognomon vulselloides Macsotay & Campos, 2001

Extinct species

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Fossil of Isognomon maxillatus from Pliocene of Italy

Extinct species within this genus include:[2]

  • Isognomon gariesensis Kensley and Pether 1986
  • Isognomon gaudichaudi d'Orbigny 1842
  • Isognomon isognomoides Stahl 1824
  • Isognomon isognomon Linnaeus 1758
  • Isognomon isognomonoides Stahl 1824
  • Isognomon legumen Gmelin 1790
  • Isognomon maxillatus Lamarck 1819
  • Isognomon nucleus Lamarck 1819
  • Isognomon quadrisulcata Ihering 1897
  • Isognomon valvanoi Rossi de Garcia and Levy 1977
  • Isognomon wellmani Crampton, 1988
Species brought into synonymy
  • Isognomon acutirostris (Dunker, 1869): synonym of Isognomon nucleus (Lamarck, 1819)
  • Isognomon anomioides (Reeve, 1858): synonym of Isognomon australica (Reeve, 1858)
  • Isognomon aviculare (Lamarck, 1819): synonym of Isognomon isognomum (Linnaeus, 1758)
  • Isognomon brevirostre Link, 1807: synonym of Isognomon isognomum (Linnaeus, 1758)
  • Isognomon dentifer (Krauss, 1848): synonym of Isognomon nucleus (Lamarck, 1819)
  • Isognomon isognomon (Linnaeus, 1758): synonym of Isognomon isognomum (Linnaeus, 1758)
  • Isognomon roberti Koch, 1953: synonym of Isognomon perna (Linnaeus, 1767)
  • Isognomon rude (Reeve, 1858): synonym of Isognomon isognomum (Linnaeus, 1758)
  • Isognomon rupella (Dufo, 1840): synonym of Isognomon nucleus (Lamarck, 1819)
  • Isognomon sulcatum Lamarck: synonym of Isognomon perna (Linnaeus, 1767)
  • Isognomon vulsella (Lamarck, 1819): synonym of Isognomon legumen (Gmelin, 1791)
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References

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