A taxonomic group of small crustaceans (tiny sea and land creatures related to shrimp and crabs) with reduced or sunken eyes.
From Greek 'edrios' (sessile, reduced) and 'ophthalma' (eyes). The term describes crustaceans with simplified eye structures.
Some tiny crustaceans live in harsh environments—like deep ocean trenches or wet leaf litter—where good vision isn't useful, so they evolved smaller, simpler eyes or lost them entirely, which is why they're grouped by this eye characteristic.
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