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Read the definitions below, then label the crayfish diagram.
Abdomen - The abdomen is the segmented tail area. The swimmerets, telson, and uropods are attached to the abdomen. Carapace - The protective shell (exoskeleton) of the cephalothorax. Cephalic groove - An indentation in the carapace between the head region and the thorax region. Cephalothorax - The combined head and thorax (this animal has no neck!). The cephalothorax contains the heart, gills, and stomach. Cheliped - One of two big claws used for defense and food handling. Eye - The two eyes are located towards the front. Long antennae - Two long, sensory organs towards the front of the crayfish. Short antennae - Two short antennae, also called antennules. Rostrum - The area above the eyes. Swimmerets - Five pairs of short appendages on the abdomen; they are used for swimming. Tail fan - The telson and the four uropods. It is used for backwards swimming. Telson - The single, hind-most extension of the tail fan. Uropods - Two pairs of appendages on the tail fan that surround the telson. Walking legs - Four pairs of long, jointed legs used for walking. The gills are attached to the tops of the walking legs.
