Name: ______________________________________________________________ Period:___________
Crayfish Anatomy & Function
“How do crayfish move/protect themselves?”
Carapace
________
A. Organs which help crayfish visualize food and escape predators.
Walking legs
________
B. Large bumpy covering over the thorax used for protection.
Abdomen
________
C. Help the crayfish touch and taste.
Swimmerets
________
D. Broad flat plates which form a paddle to move crayfish backward quickly .
Eye
________
E. Appendages with small pinchers which allow crayfish to walk/move around.
Antenna
________
G. The muscular posterior end which propels the crayfish backward.
Uropod
________
H. Small appendages on abdomen which aid in the reproduction &
development of crayfish
“How do crayfish eat/digest?”
Cheliped
________
A. Sturdy jaws around the mouth used for chewing
Mandible
________
B. Second set of internal ‘teeth’ used to grind food in stomach
Mouth
________
C. Large claws used to catch and break apart food and fight other crayfish.
Stomach
________
D. Pumps body fluid around inside of crayfish to circulate oxygen and nutrients.
Gastric Mill
________
E. Large organ which stores and digests food.
Gills
________
F. Opening which allows crayfish to ingest food.
Heart
________
G. Organ which helps crayfish breathe.
“How do crayfish excrete their waste?”
Green gland
________
A. Long tube which absorbs nutrients from food passed from stomach.
Intestine
________
B. Small opening used to excrete solid waste.
Anus
________
C. Organ which produces bile (digestion) and filters out waste from body fluids.
Liver
________
D. Functions as a crayfish bladder/kidney used to excrete liquid waste.