Good day fellow NL, have been eating this delicacy called perewincle (popularly known by the Igbo as isam)for some years now but recently a friend of mine jokingly asked me what class do perewincle belong to.
So I decided to bring it here for others to contribute, have you ever wondered, what class do perewincle belong to, it's not fish, but should we call it meat? Dietician in the house, what do you have to say about this. Is perewincle a meat? If no what is it called

Hold on, it has shell. It should be classified as a mollusc. Just to be sure, I took some time to check Wikipedia:

The common periwinkle or winkle is a species of small edible whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles. This is a robust intertidal species with a dark and sometimes banded shell.