The non-reproductive or anterior body region of certain marine worms, especially polychaetes, which differs from the reproductive posterior section.
From Greek 'a-' (without) + 'tokos' (offspring/reproduction). A zoological term distinguishing the non-reproductive body part of segmented marine organisms.
A polychaete worm's 'atoke' is the front part that just handles swimming and eating, while its back half transforms into a reproductive 'epitoke' — it's like the worm becomes two different creatures!
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