the internal structure of crayfish. organ systems.

internal structure crayfish organ systems systems: nervous system digestive excretory male reproductive female diagram organs anatomy abdomen animal animalia antenna antennule arthropoda astacus biology broad-fingered carapace cephalothorax cervical groove chela chitin claw crustacea exoskeleton external eye invertebrates isolated lateral view noble rostrum science swimmerets telson uropod vector walking legs zoology food crustacean set respiratory circulatory