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Flat tree-oyster
Isognomon alatus
(Gmelin, 1791)

This bivalve shell is attached to the substrate. The shells are brown or purple to black. The upper surface is smooth. Usually lives in clusters.
Size: up to 7 cm.

Attached to mangrove roots, wrecks and docks, but also sometimes on reefs. Anywhere where sedimentation occurs.
Depth: ranges from 0 m down to 12 m.

Occasional all over the Caribbean.

In most countries it is illegal to bring back these shells from holidays.

Flat tree-oyster (Isognomon alatus)