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The fascinating creature in this underwater scene is a Hermit Crab (Paguroidea superfamily). My three decades of studying marine… The fascinating creature in this underwater scene is a Hermit Crab (Paguroidea superfamily). My three decades of studying marine invertebrates have given me a great appreciation for the unique life cycle and adaptations of these animals. Unlike true crabs, hermit crabs possess a soft, unprotected abdomen, which they must house within a discarded gastropod shell for protection. This particular individual, with its vivid orange antennae and striking blue legs, is likely a species of Blue-legged Hermit Crab. The shell it inhabits is a vital part of its life; as the hermit crab grows, it must find and move into progressively larger shells. This constant search for a new home and its role as a scavenger, cleaning up debris on the ocean floor, make it an essential and resourceful member of the reef community.