Crayfish Internal Anatomy study guide by bennetta0078 includes 20 questions covering vocabulary, terms and more. Quizlet flashcards, activities and games help you improve your grades. External anatomy of a crayfish. 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. Part 2—Internal Anatomy of a Crayfish 1. 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. 15. You may use gloves if you want. Within this kingdom are subgroups, known as phyla. 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. 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. Dissection Procedure Carefully remove the carapace from the underlying organs. 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 … Use a probe to disconnect any muscle stuck to the carapace as it is lifted away. Put on safety goggles. 1. The crayfish has 8 jointed walking legs, a segmented body, 2 pairs of sensory antennae, and compound eyes. It has 2 large pincers or claws called chelipeds. 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). Internal anatomy of a crayfish 1. Cut along the indentations that separate the thoracic portion of the carapace into three regions. Put on a lab apron, gloves, and safety goggles. Anatomy: This crustacean has a hard exoskeleton that protects and supports the body. PROCEDURE PART 2: Internal Anatomy of a Crayfish. 2. INTERNAL ANATOMY: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. Crayfish Anatomy. 16. Part 2—Internal Anatomy of a Crayfish. Introduction: Crayfish belong to the Kingdom Animalia which includes all organisms that must consume their food (heterotrophs) and are multicellular. If a crayfish loses a leg, the leg will regenerate (regrow). 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