Oregon Department of Agriculture guides
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Species: Boettgerilla pallens 

Common name: Worm slug
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Family: Boettgerillidae 

Dorsal Boettgerilla pallens
Worm slugs were found in Oregon during 2015. This is the third known occurrence of this species in North America.
It was previously known from one site in California and several in British Columbia. The long and skinny body shape is unique among slugs in Oregon. 

Origin: Europe
Diet: Decaying animal, fungi, and plant material. Reported as a pest of seedlings in greenhouses.
Behavior: Spends most of its life underground. It can burrow as deep as 2 feet (about 60cm).
Where in Oregon: Hoyt Arboretum in Portland. ODA is interested in learning of new locations for this slug.
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Similar exotics to look for: None 

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Picture
Tail with keel raised defensively
The worm slug ranges in adult length from 35 to 55 millimeters
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