Crabs that are either clearly intertidal or normally found within permanent bodies of fresh water have not been included here, although many of these species can show some limited degree of activity on land. Some supralittoral species are included. Larval development is categorized in one of three ways: PM, larvae are released in a pelagic marine environment; ABB, larvae have an abbreviated development usually associated with a specialized environment; DIR, eggs develop directly into young crabs. Body mass is noted for the largest specimen reported in the literature. Compiled primarily by Sandra L. Gilchrist, with contributions by other authors in this book.