“Among the 566 extinct mollusk species, 400 are from oceanic islands, representing 71% of all listed mollusk extinctions. And among these 400 extinct mollusk species,327 are endemic to the most isolated islands of the world.”
Pacific islands - 225 species/subspecies
North America - 90
Asia - 59
Mascarene Islands - 49
Europe - 38
West Indies - 27
South/Central America - 21
Oceania - 13
Macaronesia - 11
Africa - 3
Others - 30
Reference: RÉGNIER, C., FONTAINE, B., & BOUCHET, P. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions Conservation Biology
