SueFarmer's picture

Mystery bug

Observed: 17th May 2011 By: SueFarmer
EZX phone
EZX phone 1
Species interactions

No interactions present.

Species with which Snails and slugs (Mollusca) interacts


SueFarmer's picture

Mystery Bug

Thank you for your observations. Only thing is there is no trail whatsoever up from the ground or down from the top (should a snail have been dropped onto the greenhouse roof) its just on the middle panes .

ktmartin's picture

Slug and snail mouthparts

I think the trail has been caused by them feeding - they have a radula ( a bit like a rough strip of sandpaper) that they scrape algae off the surface with. This results in the patterns you see.
There is perhaps no trail to the patterns cos the snail/slug wasn't feeding up until you see the pattern, just slithering along.