They are called Neritina natalensis. Do bear in mind nerites absorb a lot of calcium so you need to supplement them with calcium or risk letting them suffer shell erosion which if become more severe, the shells may need drastic measures to have them fixed. MTS are similarly great calcium absorbers as well.
I looked at the source you put before I got them. Its just that aquabby.com says their natural range is in South and Central America.
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