(Science: zoology) A genus of large edentulous sirenians, allied to the dugong and manatee, including but one species (R. Stelleri).

Synonym: Steller's sea cow.

Alternative forms: rhytina.

It is now extinct, but was formerly abundant at Behring's island, near Behring's straits. It was twenty-five feet or more in length, with a thick, blackish, naked skin. The last were killed in 1768 for their oil and flesh.

Origin: NL, fr. Gr. A wrinkle.

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