First reported in the wild
Invasive species - risk of Medium Impact
Introduction pathways - 1
NAPRA Ireland risk assessed
Large brown or black roundback slug, does not respond to mechanical stimuli by rocking and has a dull foot fringe (Anderson, 2010).
"It is the most important slug pest in Europe causing severe damage to horticultural plants in private and public gardens and cultivated crops in agriculture" (Rabitsch, 2009). Outcompetes native slugs, is the intermediate host for a number of parasites of pets and causes damage to plants (Rabitsch, 2009).
Woodland, forest and other wooded land; Constructed, industrial or other artificial habitats; Regularly or recently cultivated agricultural, horticultural or domestic habitat
Hermaphrodite, usually mates during spring with 400 eggs produced per individual (Rabitsch, 2009),though mating occurs from the end of August until the end of September in Norway, with mean of 101 eggs produced per individual (Roth et al., 2012).
Pathway and vector description
Introduced to other parts of Europe as contaminants in nursery material it is unknown at present how it came to be introduced to Ireland.
Mechanism of impact
Found in woodlands and gardens in Europe
There is widespread confusion over taxonomic status of this and a number of other slug species/subspecies and differing accounts of invasion, natural spread and native status (Pfenninger et al., 2014; Roth et al., 2012), Native range is currently thought to be west coast of France and southern Britain (Rabitsch, 2009).
Date of first record category
Fifty year date category
Records submitted to Data Centre in 2020
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How can you help
Report any sightings to the National Biodiversity Data Centre.
Delivering Alien Invasive Species In Europe (DAISIE) project list this as one of the 100 Worst Invaders in Europe.
Pfenninger, M., Weigand, A., Bálint, M., & Klussmann-Kolb, A. (2014). Misperceived invasion: the Lusitanian slug (Arion lusitanicus auct. non-Mabille or Arion vulgaris Moquin-Tandon 1855) is native to Central Europe. Evolutionary applications, 7(6), 702-713. Roth, S., Hatteland, B. A., & Solhøy, T. (2012). Some notes on reproductive biology and mating behaviour of Arion vulgaris Moquin-Tandon 1855 in Norway including a mating experiment with a hybrid of Arion rufus (Linnaeus 1758) x ater (Linnaeus 1758). Journal of Conchology, 41(2), 249. Rabitsch, W. (2009) Arion vulgaris In: Handbook of Alien Species in Europe DAISE, Springer.