Web-weaving slug

Web-weaving slug

Observation - Web-weaving slug - UK and Ireland. Description: My friend sent me this. She's certain it isn't a slug because it was hanging from its own web.. I can't be certain she hasn't found a new species but I doubt I will be able to convince her web-weaving slugs don't exist without an id. She also said it was

My friend sent me this. She's certain it isn't a slug because it was hanging from its own web.. I can't be certain she hasn't found a new species but I doubt I will be able to convince her web-weaving slugs don't exist without an id. She also said it was small. Webs aside, any ideas?