
I do not know the species of this snail. It's a non-native invasive.
Mostly this shot is just to document the type of beast that contributed the radula.
But there are a couple of aspects that did intrigue me.
First is that although the snail moved around as usual over the plastic sheet, it did not leave any slime trail -- none at all. In the image as shown, the snail has moved in a large circle starting at the debris upper right and moving counterclockwise about 270 degrees to its current position. You can't see any slime trail in the photo, and even on close inspection I couldn't see one on the plastic. Reflections of the ceiling lights were completely undisturbed, still looking as if the plastic were freshly washed. I assume this says something about the properties of snail slime, but exactly what, I have no idea.
Second relates to the reflection of the snail. When preparing the image for posting, I was struck by how bright is that little spiral in the reflection. Best I can figure, that's a specular reflection of a lighting panel on the ceiling. Looking directly at the snail, I get the feeling that the whole center turn of the shell is quite shiny, and I guess the bottom of the groove was at exactly the correct angle to make that bright reflection over the whole 1+ turns. Other pictures in the same session show bright reflections in the same area, but none of them show the whole turn this well.
--Rik