Mayotte Gulella Snail (Gulella mayottensis)
The Mayotte Gulella Snail was described in 1885, it was endemic to the island of Mayotte in the Indian Ocean.
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The species is commonly referred to as being extinct, however, given the fact that all other molluscan species on the island of Mayotte appear to be still alive, I personally do not know why this particular species should be extinct.
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(public domain)
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edited: 06.05.2019