Meng-Hua Li’s land snails are considered “medium-sized,” reaching just under an inch in length, the study said. Their “atypical” shells are pointed spirals with a “ribbed” texture.

All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...