Comprehensive Description

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Isognomon alatus is a member of the family Isognomonidae. Its' shell is fan-shaped appearing extremely compressed and thin-walled. The hinge is straight and elongated (Siung 1980). The color of the flat tree oyster is usually drab greenish white to purple-black with flaky co-marginal lamellation (i.e. thin layers or plates). The interior of the shell (nacre) is yellowish with a purple-brown stain. The border is darker (Mikkelsen and Bieler 2008). The soft body of the animal is oval and covered by an opaque mantle (Siung 1980).


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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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