Pisidae - Spider Crabs

Spider crabs, when juveniles, used hooked setae (hairs on their body) to attach algae, sponges and other invertebrates to their carapace, supposedly for camouflage. There are 2 Pisid crabs in our area, the longnose and the portly spider crabs. Their round bodies and long, thin legs give them the appearance of spiders. Their legs end in curve points which allows them to attach to irregular surfaces. They are found in seagrass beds and on sandy, muddy bottoms. They also have an association with jellyfish, especially cabbageheads, and are often found clinging to the undersides of the jellies.