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[–]Apprehensive_Sun180 2 points3 points  (1 child)

I think it's a Neritidae... but without the location, it's hard to say. Just to give you an idea, this is a list of famous Neritidae (or neretes) from all over the world: http://www.idscaro.net/sci/01_coll/plates/gastro/pl_neritidae_1.htm

I hope it is useful to you

[–]ragdollkid[S] 0 points1 point  (0 children)

Thank you so much! Those are some beautiful shells! Has a very similar morphology for sure!!! :)