The question of why there are so many species in the sea and how new species form remains a central question in marine biology. Below the waterline, about 30% of Hawaii's marine species are endemic – being found only in Hawaii and nowhere else on Earth – one of the highest rates of endemism found worldwide. But where did this diversity of species come from? In a new study of limpets, cone-shaped marine snails, researchers have demonstrated that Hawaii is not an evolutionary dead end for marine species....