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What makes you sure this is L. maximus and not a possible Lehmannia valentiana?
Regards Chris. :)
Did not think it looked pinkish and translucent enough but you might be right. If L. maximus then a juvenile.
Having looked at photos of both species on the web (and assuming that a reasonable number of the photos were correctly ID'd) then Lehmannia valentiana does seem a distinct possibility to me as they were on the allotment and did not seem that big compared to other slugs around. I think I have seen Limax maximus elsewhere not on the allotment and it seemed much more big and meaty almost a frightening beastie.
Always the problem is to know if it is an adult or not. Young L. maximus is also very cute. This can only be ascertained by methods not now considered acceptable.
I have added a couple more images which may or may not help, they were taken at same place same time I had assumed this slug was same species (not the Tandonia budapestensis) even though its looks a bit yellower than the other one. the flash has altered the colours slightly.
One other bit of info is that I have never seen an adult Limax maximus on the allotments, this does not rule them out as slugs generally get removed as soon as seen but there are quite a lot of other adult large slugs around each year.
The yellow one looks like an Arion but a view of the breathing pore (other side) would make that certain.
Picture 4. The breathing pore is at the rear of the mantle and the rings are centred on the mid-line so this is a member of the Limacidae.
Very well informed discussions. I'm pretty sure that all the pale slugs are the same species, and they are Lehmannia. L. valentiana very commonly has the two narrow dark bands high up on the sides of the body and along the mantle. The pink example is typical. I've occasionally seen orange-brown ones which were definitely valentiana when dissected.
Another feature which is often helpful is that Lehmannia tend to have shorter tentacles than Limax. The right tentacle of the orange one is an exception, but in one photo it bends oddly, so might have been damaged and over-grown.
One other possibility would be Lehmannia nyctelia, which is starting to occur outdoors in Britain. I'm not sure if it's separable without dissecting.
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