Deroceras laeve
Deroceras laeve, the marsh slug, is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Agriolimacidae. Distribution The distribution of Deroceras laeve was originally Palearctic, from the subpolar zones to the southern margins. Today this slug species has been introduced worldwide except Antarctica, also on tropical islands such as New Guinea and on Pacific islands. Europe: British Isles: Great Britain and Ireland. The species has shown little evidence for significant decline in Britain. Czech Republic - least concern (LC) Netherlands Poland Slovakia Ukraine Sweden Switzerland - lower concern in Switzerland and others Asia: Pakistan China Taiwan India The Americas: California Costa Rica El Hatillo Municipality, Miranda, Venezuela Colombia introduced to Dominica (first report in 2009) introduced to Brazil Description The slug is from brown to dark brown, usually with dark and characteristic but not well visible spots arranged in groups. The shape is almost cylindrical, posterior end is abruptly widened. The mantle covers 50% of body length (unusually large). There are wrinkles on skin present (may disappear in preserved slugs). Mucus is thin, colourless. This slug is 15–25 mm long when preserved. The populations of this species that occur in Central Europe are much