Pāpa`i Thalamita crenata known as the Blue Pincher Crab is indigenous to the Pacific Islands and unlike most swimming crabs is most active in the daytime.
They are gray to greenish brown with a white tipped claws and a broad back band. Their bodies are sometimes pink and the upper part of their claws are blue. They grow to a width of approximately five inches. The live in brackish muddy areas and sandy areas of salt water. They dine on limu, small pieces of plant and animal matter, snails, and mangrove detritus.