Deroceras laeve (Mueller, 1774)
Morphology:
Müller (1774) original descriptions on Limax laevis – “Limax niger, glabriuſculus. Corpus totum nigrum, nitidum, absque rugulis nudo oculo in clypeo aut abdomine conſpicuis; nec ſtriæ ullæ margine abdominis ſupra aut ſubtus. Planum inferius utrinque nigrum absque ſtriis transverſis, area media longitudinali ſola pallida. Ope lentis in clypeo ſtriæ transverſæ undulatæ, non interruptæ; in dorſo abdominis rudimenta rugularu conſpiciuntur.”
Size:
Limax laevis – “Long. 5 lin, lat. 1 lin.” (Müller, 1774)