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Genus: Deroceras 

​Common name: Field Slugs
Family: Agriolimacidae

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Deroceras reticulatum, gray field slug
Origin: Europe
Diet: Live and dead plants and almost any decaying organic material. These are some of the most significant crop and garden pests, D. reticulatum in particular.
Where in Oregon: Widespread.
Similar exotics to look for: Oregon has 3 species. With over 100 species worldwide, this is a difficult group, requiring dissection for definitive species identification. 
Lateral image of Deroceras reticulatum and Deroceras leave next to a quarter. Size range of adults of the genus ranges from 15 to 50 millimeters
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Deroceras laeve, meadow field slug
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Deroceras reticulatum, gray field slug, defensive posture.
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Deroceras reticulatum, gray field slug
Deroceras invadens lateral
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Deroceras invadens, longneck field slug
Quick key to species of Deroceras
1. Mantle less than half of body length
    A. From the side, tail slopes gradually; rim of pneumostome pale or body color, defensive mucus white (30-50mm)....D. reticulatum
Tail of Deroceras reticulatum secreting milky white defensive mucus
      B. From the side, tail is steeply truncate; rim of pneumostome paler than body, defensive mucus clear (25-35mm)....D. invadens
2. Mantle half as long as body or longer. (15-25mm)....D. lavae
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