Plural of annelid; segmented worms belonging to the phylum Annelida, including earthworms, leeches, and marine worms.
From modern English plural of 'annelid,' ultimately from Latin 'annellus' (small ring); the standard modern scientific term.
Annelids were probably the first animals to develop a true brain and segmented body plan—they're basically the ancestors of all more complex animals with backbones!
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