A small, needle-like structure or bristle, particularly found in annelid worms (segmented worms) that helps them move and anchor themselves.
From Latin 'acus' (needle) + '-culum' (diminutive suffix meaning 'small'). A zoological term that emerged in the 19th century to describe specific appendages in marine organisms.
Picture a tiny bristle sticking out of a worm's body—that's an aciculum! Worms use hundreds of these little needle-like hairs to grip onto surfaces and creep along, like microscopic anchoring hooks.
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