Lacking a trochal (wheel-like ciliary) band; another term for atrochal.
From Greek 'a-' (without) + 'trochos' (wheel) + '-ous' (full of, characterized by). This variant form emphasizes the absence of ciliary structures in larval development.
While 'atrochal' is the common way to say it, 'atrochous' sounds more technical—marine biologists sometimes switch between them, but they mean the exact same 'missing-its-cilia' situation!
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