Arion wiktori Parejo & Martin, 1990
Animals were found active between -3 and 14°C, in autumn and spring.
External: Slug brownish to greyish green with darker brown lateral bands; skin delicate with poorly marked sculpture; sole cream or with orange lateral fields; mucus transparent, colourless.
Internal: Anterior part of genitalia short; free oviduct with folds inside; spermatheca duct with longtudinal folds inside; retractor muscle with two branches attaching to free oviduct and spermatheca duct; one retentor muscle holding the posterior part of the atrium, another one the anterior part of the free oviduct.
Size: Preserved: Up to 40 x 12 mm.
N Spain.
Type Locality: N Spain: La Rioja, Ventrosa, Collado Hondo, valley of Najerilla river, UTM WM1473, 1000 m.
In deciduous and coniferous mountain forests, also in ruderal habitats; under stones and bark during daylight, always above 800 m.