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Trochonema
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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Trochonema

fossil gastropod genus
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Related Topics:
gastropod
fossil

Trochonema, genus of extinct gastropods (snails) found as fossils in rocks dating from the Ordovician Period to the Devonian Period (505 to 360 million years ago). The shell of Trochonema consists of a series of turretlike whorls, each ornamented by slight lines. The aperture is large, conspicuous, and roughly circular.