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Isognomon

Animal
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. Fossils of species within this genus have been found all over the... Wikipedia
Scientific name: Isognomon
Higher classification: Isognomonidae
Rank: Genus
Genus: Isognomon; Lightfoot, 1786