I decided to do a little experiment. awhile ago, I went to the canyon in the Snake River, and I found a bunch of gastropod shells. Not extinct, these were not fossilized. I decided to bring some home and compare them to a fossil gastropod shell that I had.
I am aware that differences and similarities vary by species, but I don't know gastropod species that well, extinct or not.
Pictures are attached under a magnifier. The white one is the living, the brown one is the extinct fossil.
Due to file size, I'm posting the fossil on a different post.
I want to invite others to point out what they notice is different and similar about the living and extinct gastropods. (Besides the obvious fossil/non-fossil)
I'll point out what I notice myself later.