The crayfish has 8 jointed walking legs, a segmented body, 2 pairs of sensory antennae, and compound eyes. Cut along the indentations that separate the thoracic portion of the carapace into three regions. Internal anatomy of a crayfish 1. Using one hand to hold the crayfish dorsal side up in the dissecting tray, use scissors to carefully cut through the back of the carapace along dissection cut line 1, as shown in the diagram below. 1. Cephalic groove an indentation in the carapace between. 16. Using one hand to hold the crayfish dorsal side up in the dissecting tray, use the scissors to carefully cut through the back of the carapace along the dissection cut line #1 (as seen below on the diagram). Crayfish Anatomy. Part 2—Internal Anatomy of a Crayfish 1. Dissection Procedure Carefully remove the carapace from the underlying organs. It has 2 large pincers or claws called chelipeds. 15. PROCEDURE PART 2: Internal Anatomy of a Crayfish. External anatomy of a crayfish. Put on a lab apron, gloves, and safety goggles. The crayfish has 8 jointed walking legs a segmented body 2 pairs of sensory antennae and compound eyes. Put on safety goggles. Crayfish Anatomy Phylum Arthropoda: In this lab, you will become familiar with the external and internal anatomy of a crustacean arthropod, the crayfish, Cambarus sp. 2. Using one hand to hold the crayfish dorsal side up in the dissecting tray, use scissors to carefully cut through the back of the carapace along dissection cut line 1, as shown in the diagram below. INTERNAL ANATOMY: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. The normal life span of a crayfish is about 2 - 3 years, and on average can get up to 6 inches in length though sometimes they are found to be larger. Anatomy: This crustacean has a hard exoskeleton that protects and supports the body. As you begin your dissection to learn more about crayfish anatomy, specifically the internal anatomy of a crayfish, identify internal structures such as the digestive glands, ventral nerve cord, parts of the circulatory system and nervous system, parts of the reproductive … Phylum Arthropoda, Subphylum Crustacea. Introduction: Crayfish belong to the Kingdom Animalia which includes all organisms that must consume their food (heterotrophs) and are multicellular. You may use gloves if you want. Anatomy of a Crayfish . Locate the dorsal tubular heart and several arteries. Use a probe to disconnect any muscle stuck to the carapace as it is lifted away. If a crayfish loses a leg, the leg will regenerate (regrow). 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