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Arion cf. rufus
Colour can be extremely variable, even within individual populations. Most commonly it is grey or orange, but extreme morphs of black and almost white are rarely recorded. The foot fringe is virtually always bright orange and is strongly lineolated. The sole is paler than the body sides, often with a distinctive orange tinge, particularly towards the head. Lines extending from the fringe can commonly be observed on the sole and can sometimes stretch almost to its center. Tentacles and head are almost always darker than the rest of the slug. Mucus is thick, sticky and colourless. Tubercles are large, but can often appear flattened. Juveniles can be strongly banded and are often brighter in colour.
Ubiquitous in lowland regions; commonly occurs in gardens, woods, moors and agricultural land. Can also be found in several upland locations.
I am not sure if this the correct species name. Adults of this species can be almost impossible to accurately distinguish from both Arion ater and Arion vulgaris. This is not helped by the fact that it is believed the three species may be able to hybridism. This slug also had a peculiar slimy globule on its tail as seen in the last two photos. Spotted in Spielderbos, Veluwe, Holland. (sources:see reference)