Panopeus herbstii
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| Panopeus herbstii H. Milne Edwards, 1834 |
Panopeus herbstii (the black-fingered mud crab, black-clawed mud crab, Atlantic mud crab or sometimes common mud crab) is a true crab, belonging to the infraorder Brachyura, and is the largest of the mud crabs.
P. herbstii is small, growing up to be about 4 cm, with has black-tipped claws of an unequal size. P. herbstii has a strong exoskeleton, with very thick and strong claws. The shell is a dull gray and brown color.
P. herbstii is found on muddy bottoms where it takes refuge under stones and shells or among sponges and weeds, but it is rarely seen in the open. It feeds mainly on young clams, oysters, and periwinkles; it cracks open their shells with its strong claws. Mud crabs are especially fond of hermit crabs, which are grasped by the legs and pulled out of their protective shells. Like most mud crabs, it is a scavenger. Young P. herbstii are an important food source to other marine animals.
