Carcinology
Carcinology, from Ancient Greek καρκίνος (karkínos), meaning "crab", and λόγος (lógos), meaning "study", is a branch of zoology that consists of the study of crustaceans. Crustaceans are a large traditional subphylum of arthropods classified by having a hard exoskeleton made of chitin or chitin and calcium, three body regions, and jointed, paired appendages.