
Originally Posted by
Cantab
Not being an expert on slug anatomy, I found helpful information on a webpage for a US university. And yes, the upper pair of tentacles are optical. The lower pair are sensory for feeling food.
Despite the different size of the two images I posted, the original RAW images have almost identically sized versions of the slug. In your editing work, have you tried cutting and pasting to put something together? Although the slugs are definitely not attractive, these photos might be straight forward examples on which to try a head transplant. Then I'd have a slug entirely in focus.