Ensis

Bivalve

Eocene -Recent

Characterized by an extremely elongated, thin, featureless shell (approximately 12 cm in length) with both posterior and anterior gapes. Ensis lives infaunally in muds and sands in the intertidal zone. During feeding, the anterior part of the shell is close to the sediment-water interface. During low tide, the animal burrows actively down into deeper sediments using the muscular foot.

Bivalve

Eocene -Recent

Teredo is a highly specialized bivalve able to bore into wood. The cylindrical shell is extremely reduced (approximately 1.2 cm from umbo to shell edge). Sharp sculpture on the external surface is used for tunneling into the substrate. The shell is reduced and the animal is essentially worm-like and lives encased in the burrow, growing to fill the excavated space.

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