Describing marine organisms, particularly crustaceans, with naked, uncovered, or unsheathed antennae or horn-like appendages.
From Greek gymnos (naked) + kerat- (horn/antenna) + -ous (having). The adjectival form applies the characteristic to organisms with exposed antenna structures.
Zoologists literally couldn't stop themselves—they named ocean creatures based on whether their feelers were wrapped up or not, turning 'nakedness' into a major taxonomic principle!
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