1. By: Tricia Redburn

2. Internal Anatomy Encephalon: site of the mental functions of a crayfish. Stomach: part of the digestive tract between the esophagus and the intestine. Heart: blood-pumping organ of the crayfish. Gonad: sex gland of a crayfish. Extensor muscles: muscle that extends the tail of the crayfish. Anus: outlet of the digestive tract. Flexor muscle: muscle that bends the tail of the crayfish. Digestive gland: glandular organ that produces digestive enzymes. Ganglion of ventral nerve cord: budge related to a collection of nerves of the abdomen of a crayfish. Ventral nerve cord: collection of nerves in the abdomen of a crayfish. Maxilliped: pair of appendages of a crayfish used for holding prey. Esophagus: part of the digestive tract between the mouth and the stomach. Mandible: lower jaw. Mouth: entrance to the digestive tract. Green gland: antennary gland. Eye: sight organ of a crayfish.

3. External Anatomy Antennule: used to sense things. Compund eye: used to help the crayfish see. Rostrum: protective plate between eyes. Cephalic Groove: seperates head from chest. Cephalothorax: the head and chest region. Abdomen: tail region of the crayfish used for swimming. Telson: Center of the tail. Uropod: the tail. Swimmerets: help the crayfish swim. Walking legs: help crayfish walk. Chelipeds: Enable crayfish to catch foods. Maxillipeds: enable crayfish to taste and hold food. Anntenae: helps to sense things.

4. Classification Kingdom: Animal Phylum: Arthropods Class: Crustacean Order: Decapods Family: Cambaridae Genius: Cambarus

5. Fun facts Crayfish can be found in just about any body of fresh water which isn't overpolluted. This includes streams, rivers, lakes, ponds, and sometimes even water-filled ditches. Crayfish are very common in Northern Virginia, but they are difficult to identify. There are three common genera : Cambarus, Orconectes, and Fallicambarus. Most of our crayfish are Cambarus. Crayfish can usually be found by turning over rocks in small streams and creeks; the larger the rock, the larger the crayfish. Crayfish are nocturnal, so they do most of their hunting at night.

6. Where I got my information from http://www.fcps.edu/islandcreekes/ecology/cr ayfish_%28cambarus%29.htm http://www.fcps.edu/islandcreekes/ecology/cr ayfish_%28cambarus%29.htm https://quizlet.com/1854643/crayfish- external-anatomy-flash-cards/ https://quizlet.com/1854643/crayfish- external-anatomy-flash-cards/ http://www.infovisual.info/02/025_en.html

7. Crayfish