Arion gilvus is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs.
Description Arion gilvus is a medium-sized species, reaching an extended length of up to 65 mm
The back is typically a yellowish to brown color. The body color lightens as it moves downward along the flanks. The flanks are marked by dark lateral bands. A distinctive feature is the presence of a yellowish-grey line running along the upper edge of these dark bands. The foot sole is white or a uniformly yellowish color. The slime secreted by the animal is a pale yellow.Breugelmans Karin, Jordaens Kurt, Adriaens Els, Remon Jean Paul, Quintana Cardona Josep, Backeljau Thierry (2013). "DNA barcodes and phylogenetic affinities of the terrestrial slugs Arion gilvus and A. ponsi (Gastropoda, Pulmonata, Arionidae)". ZooKeys 365: 83--104. Pensoft Publishers. DOI:10.3897/zookeys.365.6104
Distribution This species occurs in the eastern coastal region of Spain.
References
Bank, R. A.; Neubert, E. (2017). Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16th, 2017. Garrido, C., Castillejo, J. & Iglesisas, J. (1995). The Arion subfuscus complex in the eastern part of the Iberian Peninsula, with redescription of Arion subfuscus (Draparnaud 1805) (Gastropoda: Pulmonata: Arionidae). Archiv für Molluskenkunde, 124 (1/2): 103-118. Frankfurt am Main.