clade Euthyneura clade Nudipleura clade Nudibranchia clade Dexiarchia clade Cladobranchia Fimbria O'Donoghue, 1926 (invalid: junior homonym of Fimbria Megerle, 1811.)

Tethys is a genus of sea slugs, nudibranchs, marine gastropod mollusks in the family Tethydidae.

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