No interactions present.
Ian is correct. There are several similar species - A.ater, rufous, flagellus, vulgaris, etc. Without dissection best treated as A.ater agg. (or A.ater complex).
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Arion ater whilst common , belongs to a species complex that can only be differentiated by dissecting the genitalia so it is usual to record them as part of this aggregate group. The complex has 3 or so associated species (Arion ater group): Arion ater, A. rufus and A. vulgaris
I suspect as you point out that the 22 or so pages on i-spot would be better designated as Arion ater agg
Whats Happening with Nature ??? Visit the Nature Blog
Supporting FEET Conservation work & Biodiversity Recording
Lat/Lng: 51.6667, -4.1283
OS grid ref: SS529985