1 taxa in Decapoda. The head breastplate is slightly square, about 10 ~ 40 mm long and about 15 ~ 50 mm wide. Its appearance is similar to that of the common square crab, and it lives in fresh water all its life.
It includes Zingiberoidea, Zingiberoidea and SinoZingiberoidea. Common crabs are middle-bellied crab, hairy-footed crab and Scylla serrata.