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Stylommatophora

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Identification Guide to Land Snails and Slugs of Western Washington

by Timothy A. Pearce, Casey H. Richart, William P. Leonard, and Paul A. Hohenlohe

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Ariolimax columbianus

Ariolimax columbianus (Gould, 1851)

Common name(s): Banana slug

Size:
Ariolimax columbianus is the second largest land slug in the world. Adults range from 15-20cm in length. Some have been recorded at 25.4 cm!