- jointed appendages
- cephalisation is pronounced
- bilateral symmetry
- exoskeleton of chitin
- moulting allows growth
External Features of the Crayfish
Antennae: sensory organs towards the front of the crayfish. Antennae are connected to the brain by nerves.
Antennules: smaller antennae
Cheliped: the crayfishes first walking legs. They are used primarily for catching prey.
Rostrum: a hard protective covering in a triangular shape which protects the area of the head above the eyes.
Carapace: the exoskeleton which protects the crayfishs cephalothorax
Cephalothorax: the crayfishs head and thorax
Abdomen: the segmented tail area. Attached to the abdomen are the swimmerets, telson, and uropod.
Swimmerets: 10 appendages which are used to swim
Uropod: an extension of the tail
Telson: appendages on the tail which surround the uropod