The crayfish has 8 jointed walking legs a segmented body 2 pairs of sensory antennae and compound eyes. Crayfish Internal Anatomy study guide by bennetta0078 includes 20 questions covering vocabulary, terms and more. The crayfish has 8 jointed walking legs, a segmented body, 2 pairs of sensory antennae, and compound eyes. Phylum Arthropoda, Subphylum Crustacea. 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. If a crayfish loses a leg, the leg will regenerate (regrow). The gills, which are feather-like structures found underneath the carapace and attached to the chelipeds and walking legs, are the organs of the respiratory system.. A constant flow of blood to the gills releases carbon dioxide and picks up oxygen. 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. External anatomy of a crayfish. Quizlet flashcards, activities and games help you improve your grades. Anatomy of a Crayfish . 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. Introduction: Crayfish belong to the Kingdom Animalia which includes all organisms that must consume their food (heterotrophs) and are multicellular. 15. You may use gloves if you want. 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 … Internal anatomy of a crayfish 1. Cut along the indentations that separate the thoracic portion of the carapace into three regions. Locate the dorsal tubular heart and several arteries. Use a probe to disconnect any muscle stuck to the carapace as it is lifted away. 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. 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). Part 2—Internal Anatomy of a Crayfish. Put on safety goggles. PROCEDURE PART 2: Internal Anatomy of a Crayfish. 16. Anatomy: This crustacean has a hard exoskeleton that protects and supports the body. Crayfish Anatomy. It has 2 large pincers or claws called chelipeds. Part 2—Internal Anatomy of a Crayfish 1. Within this kingdom are subgroups, known as phyla. 2. 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