Deroceras reticulatum

Deroceras reticulatum was until recently included under the name Agriolimax agrestis (Linnaeus, 1758) in older literature. Deroceras agreste, however, is a separate species and records of D. agreste in B.C. probably refer to D. reticulatum (Forsyth, 2004).

It has a wide global distribution and is found in most temperate and subtropical regions (Roth and Sadeghian, 2003) including Asia, Australia, Canada, Europe, New Zealand, the United States, South Africa, South America, and islands of the Pacific and Atlantic Oceans but its native range is thought to be western Europe (Forsyth, 2004).

It has a wide global distribution and is found in most temperate and subtropical regions (Roth and Sadeghian, 2003) including Asia, Australia, Canada, Europe, New Zealand, the United States, South Africa, South America, and islands of the Pacific and Atlantic Oceans but its native range is thought to be western Europe (Forsyth, 2004).

Multiple species of Deroceras spp. were recorded in eastern Maine (11 of 101 sites) from litter samples in a variety of habitats (Nekola, 2008). In New York, Hotopp and Pearce (2007) report it from 7 counties in central and southeastern regions as introduced It was documented recently in southeastern Wisconsin (Jass, 2006). In California it occurs in 24 counties: Alameda, Butte, Calaveras, Contra Costa, Del Norte, Los Angeles, Marin, San Bernardino, San Francisco, Tulare, Santa Clara, Ventura, Humboldt, Imperial, Kern, Monterey, Sacramento, San Luis Obispo, Shasta, San Mateo, Santa Barbara, Santa Cruz, Sonoma, and Riverdale (McDonnell et al., 2009). It had been documented historically in Colorado (Cockerell, 1927) as Agriolimax agrestis. Forsyth (2006) documented introduced populations at Lac des Arcs, Alberta and museum records from Waterton Lake National Park (verified anatomically). Forsyth (2005) documented it in the Upper Fraser Basin of central British Columbia at an abandoned farm site, roadside highway pullouts, and a provincial park but is widely introduced in the rest of British Columbia; including one site (along a lake shoreline near Mackenzie) in the Peace River- northern Rockies region (Forsyth, 2005). Most recently, it was discovered in the Ktunaxa Traditional Territory in southeastern British Columbia (which extends from near Canada - U.S. border north to about 50 km north of Cranbrook) (Ovaska and Sopuck, 2009).