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Garden Slug

Scientific Name
Arion hortensis
Scientific Author
FĂ©russac, 1819
(Gastropoda: Pulmonata: Arionidae)
Pest Status
0 Unknown
NZ - Exotic

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Diagnostic Images

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Diagnostic Images (2)
Diagnostic Notes
Extended length of living specimens 25-50 mm. General colour variable, but typically blue-black with a nearly black dorsum; on either side of body a longitudinal dark band; head, ocular peduncles, and inferior tentacles with a reddish or violet tinge; sole varying from pale yellow to bright orange; mucus yellow and sticky. Bodywall grooved into tubercles. Mantle not grooved into tubercles, but also showing a dark band on either side, situated rather dorsally; right mantle band running over pneumostome, never showing a break or notch. Shell granules discrete, variable in size and distribution under mantle. Genitalia with free oviduct tripartite; entry of epiphallus to atrium with an elongate oval verge; spermatophore stout, with a strongly serrate longitudinal ridge. Jaw about 1 mm wide, arcuate, composed of 7-12 fused ridged plates. Radula with 100-120 transverse rows of teeth, each with formula 29-35+C+29-35. Central tooth tricuspid, with a wide symmetrical basal plate; mesocone slender and pointed; ectocones short and pointed to rounded. Transition from lateral to marginal teeth gradual. First lateral teeth robust, with only the external vertex prominent on a wide basal plate; mesocone long and robust, pointed; regressed endocone a slight indentation at about 0.5 of mesocone length; ectocone short, wide, and sharply pointed. Teeth near margin of radular ribbon small, weakly cusped but multicuspid, with the short mesocone most prominent.

- Barker, G.M. (1999). Naturalised terrestrial Stylommatophora (Mollusca: Gastropoda). Fauna of New Zealand 38. Manaaki Whenua Press, Lincoln, 253 pp.
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory
MAF Plant Health & Environment Laboratory
14/04/2011 09:13 AEST
Last Updated
19/03/2014 20:24 AEST
MAF Plant Health & Environment Laboratory (2011) Garden Slug (Arion hortensis) Updated on 3/19/2014 8:24:14 PM Available online: PaDIL -
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Free for use under the Creative Commons Attribution 3.0 Australia License