Relating to or characteristic of epimeres; describing the lateral or outer segments of a crustacean's body.
From 'epimere' (from Greek 'epi-' upon + 'meros' part) + '-al' (suffix forming adjectives).
When you look at a crab or shrimp sideways, the epimeral parts are the bits sticking out to the sides—they're the expanded outer edges that give crustaceans their characteristic crunchy exterior.
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