Isognomon
Encyclopedia
Isognomon is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of marine
Marine (ocean)
Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 bivalve mollusks which are related to the pearl oyster
Pearl oyster
Pearl oysters are saltwater clams, marine bivalve molluscs of the genus Pinctada in the family Pteriidae. They have a strong inner shell layer composed of nacre, also known as "mother of pearl"....

s.

Some of the species in the genus are known as tree oysters because they are edible, and grow on mangrove
Mangrove
Mangroves are various kinds of trees up to medium height and shrubs that grow in saline coastal sediment habitats in the tropics and subtropics – mainly between latitudes N and S...

 roots.http://64.233.183.104/search?q=cache:VU6vzxPrLtYJ:www.papuaweb.org/dlib/tema/kamoro/muller-sda/12.rtf+%22tree+oyster%22+mangrove&hl=en&ct=clnk&cd=11

Species

    • Isognomon alatus
      Isognomon alatus
      Isognomon alatus, or the flat tree oyster, is a species of bivalve mollusc in the family Isognomonidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda....

      (Gmelin, 1791) — Flat tree-oyster
    • Isognomon bicolor (C. B. Adams, 1845)
    • Isognomon ephippium
    • Isognomon isognomum
    • Isognomon janus
    • Isognomon legumen
    • Isognomon perna Linnaeus 1767)
    • Isognomon radiatus
      Isognomon radiatus
      Isognomon radiatus, or Lister's tree oyster, is a species of bivalve mollusc in the family Isognomonidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda....

      (Anton, 1839) — Lister's tree oyster
    • Isognomon recognitus
    • Isognomon vulselloides Macsotay & Campos, 2001
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