All snails and their ancestors, the Gastropods, share a common feature. We people with fancy Ph.D.’s in biology call this a synapomorphy, a word derived from the Greek words for “together with”, “away from”, and “shape”, namely syn, apo, and morphe. You might think the shell is a common feature of snails, but Gastropoda also . . . → Read More: How the Gastropod Got Its Twist