Small crustaceans exchange gases across thin areas of the
cuticle, but larger species have gills
The circulatory system is open, with a heat pumping
areas of the cuticle, but glands regulate the salt balance
of the hemolymph.
Most crustaceans have separate sexes.
– Males use a specialized pair of appendages to transfer
sperm to the female’s reproductive pore.
Most aquatic species have several larval stages