Crustaceans

Crustaceans are an extremely diverse group of primarily aquatic arthropods with two pair of antennae. The class includes such culinary delights such as shrimp, lobsters, crayfish, and barnacles. Although most are free-living, a few are parasitic. Primitive crustaceans have three main body parts: a head, a thorax, and an abdomen. There is a tendency, however, for the head and thorax to fuse and form a single cephalothorax.

Figure 1. Major organs and appendages of the water flea, Daphnia	Figure 2. Crayfish external anatomy.	Figure 3. Crayfish mouth parts and associated  structures.	Figure 4. Biramous Appendages of a Crustacean.
Figure 5. Internal Anatomy of a Crayfish.	Figure 6. Gastric mill of the cray fish or lobster showing the internal teeth that are involved in grinding the food.	The Crayfish, Dorsal Surface	Crayfish, Ventral Surface (Female)
Crayfish, Ventral Surface (Male)	Initial Dissection of a Crayfish Note the heart.	Deep Dissection of the Crayfish