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Doesn't really look like a stomatella. With a stomatella you cannot see its shell from underneath as they crawl on the glass. It really looks like the foot of a chiton, limpet or abalone.
Well at the moment it seem to relocate but the color were white she'll and brown spots. Also it had very small antenna but never moved at the time. I reserved the names you guys posted and it was cross between chinoto or abalone ...in my opinion...