Isognomon
(For the tree oyster mushroom, see ''Pleurotus ostreatus''.) ''Isognomon'' is a genus of marine bivalve mollusks which is related to the pearl oysters. ''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. 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. Description These oysters grow to be about 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. It is because of the preference for mangroves that these are sometimes called tree oysters
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