Posts Tagged ‘Shell Of Mollusk’

Which Came First, Shells or No Shells? Contrary Story of Ancient Mollusk

fossil unearthed in Great Britain may end a long-running debate about the mollusks, one of life’s most diverse invertebrate groups: Which evolved first, shelled forms like clams and snails, or their shell-less, worm-like relatives? The small new fossil, found in marine rocks along the English-Welsh border, provides the best fossil evidence yet that the simpler […]