A segmented worm with a body divided into ring-like segments, including earthworms, marine polychaetes, and leeches. They have a true coelom and a closed circulatory system.
From Latin 'annellus' meaning 'little ring,' referring to the segmented appearance of these worms. The term was introduced by French naturalist Jean-Baptiste Lamarck in 1809 to describe this group of segmented worms.
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