A member of the class Aplacophora; relating to or describing these shell-less marine mollusks.
From 'Aplacophora' (the class name) plus '-an' (a suffix denoting membership). Used as both a noun for individual organisms and an adjective for their characteristics.
Scientists keep discovering new aplacophoran species in deep ocean trenches—imagine living things so obscure that we're still learning what they are!
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