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The Crayfish

CRAYFISH

Kingdom: Animalia

Phylum: Arthropoda

Class: Crustacea

Order: Decapoda

Genus: Cambarus

 

Arthropoda characteristics

 

-          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.

 

Head

 

Compound Eye

 

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

 

Walking legs

 

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

 

 

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By Alex and Jessie