Proleg

Lepidoptera: Papilio machaon caterpillar with four pairs of medial prolegs and a pair of anal prolegs
Hymenoptera: Craesus septentrionalis caterpillars with seven pairs of prolegs

A proleg is a small, fleshy, stub structure found on the ventral surface of the abdomen of most larval forms of insects of the order Lepidoptera, though they can also be found on larvae of insects such as sawflies.

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