Amphibious. The trilobite can breathe air and water.
Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit:4 (1d6 + 1) bludgeoning damage, and the target is grappled (escape DC 11). The trilobite has two claws, each of which can grapple only one target.
On the beaches and banks of the rivers and seas, crabs scuttle across the sand and birds wade in the shallow water. Trilobites are among the most common shore-dwellers, including predatory varieties as well as scavengers and filter-feeders consuming scraps they find in the sand.