-Animals (Kingdom Animalia)

-Arthropods (Phylum Arthropoda)

-Crustaceans (Subphylum Crustacea)

-Typical Crustaceans (Superclass Multicrustacea)

-Malacostracans (Class Malacostraca)

-Decapods, Isopods, and Allies (Subclass Eumalacostraca)

-Decapods and Krill (Superorder Eucarida)

-Decapods (Order Decapoda)

-Crabs, Lobsters, Shrimps, and Allies (Suborder Pleocyemata)

-True Crabs (Infraorder Brachyura)​

-Eubrachyuran Crabs (Zoosection Eubrachyura)

-Thoracotrematan Crabs (Zoosubsection Thoracotremata)

-Land, Shore, and Marsh Crabs (Superfamily Grapsoidea)

-​Land Crabs (Family Gecarcinidae)

-Genus Cardisoma

-Mouthless Crab (Cardisoma crassum)

The Mouthless Crab (Cardisoma crassum) is a terrestrial crab living near wet areas such as the margins of mangroves, transitional forests, river banks, and beaches but spawns in estuaries and the ocean. It is native to the tropical Eastern Pacific, from the Gulf of California to Peru. It has a purplish-blue shell, red legs and white main pincer. It diest consists of Mangrove leaves, other plants, and dead animals. It is preyed upon by a variety of birds, reptiles and mammals.