A condition where organisms have fused or joined body segments, segments that should be separate become stuck together.
From Greek 'ankylos' (stiff, crooked) + 'merism' (division into parts). The Greek root originally referred to stiffness or limitation of movement, evolving through medical terminology to describe physical fusion of body parts.
This term reveals how ancient Greek doctors observed stiffness and imagined it as 'crookedness'—the word literally means 'bent'! By combining it with 'merism' (parts), scientists created a term for when body segments abnormally fuse together, like in certain arthropods.
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