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002. External Anatomy – Penn State Altoona Biology 110 Step 1 Place the preserved crayfish in a dissecting tray. Step 2 Note that the body of the crayfish is divided into three parts: the head, the cephalothorax, and the abdomen. Step 3 Head – Identify the compound eyes on the rostrum portion of the head. Step 4 Cephalothorax – Find the Carapace, the covering of the cephalothorax region. Step 5 crayfish dissection - Moore Public Schools The crayfish moves backward by forcing water forward with its tail fan. Materials: • safety goggles, gloves, magnifying glass, a lab apron, plastic ziplock bag preserved crayfish, pen, dissecting tray, paper towels, scissors, forceps, dissecting needle, and dissecting pins. Procedure Part 1—External Anatomy of a Crayfish 1. Anatomy of the Crayfish | Carolina.com Crayfish are members of the large and diverse animal phylum Arthropoda. It’s thought that two-thirds or more of all animals are arthropods. We use cookies to provide you with a great...