Primordial Spiny Slug from China Was Forerunner of World’s Mollusks

WASHINGTON (Reuters) — Earth’s roughly 76,000 species of mollusks come in an impressive variety of forms including clams, oysters, scallops, mussels, snails, slugs and even some possessing exceptional intelligence such as octopuses, cuttlefish and squid. But their ancestral form and early evolutiona...