15. Within this kingdom are subgroups, known as phyla. Internal anatomy of a crayfish: edible freshwater crustacean, with pincers on the two The body of a scorpion is divided into two parts: the cephalothorax (also.internal anatomy: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. 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. It has 2 large pincers or claws called chelipeds. Cut along the indentations that separate the thoracic portion of the carapace into three regions. 16. You may use gloves if you want. 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). Dissection Procedure Carefully remove the carapace from the underlying organs. Locate the dorsal tubular heart and several arteries. Anatomy: This crustacean has a hard exoskeleton that protects and supports the body. Put on a lab apron, gloves, and safety goggles. Part 2—Internal Anatomy of a Crayfish 1. Part 2—Internal Anatomy of a Crayfish. Crayfish Internal Anatomy study guide by bennetta0078 includes 20 questions covering vocabulary, terms and more. 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. The crayfish has 8 jointed walking legs a segmented body 2 pairs of sensory antennae and compound eyes. Put on safety goggles. Phylum Arthropoda, Subphylum Crustacea. External anatomy of a crayfish. PROCEDURE PART 2: Internal 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. Anatomy of a Crayfish . Quizlet flashcards, activities and games help you improve your grades. INTERNAL ANATOMY: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. Cephalic groove an indentation in the carapace between. 1. 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. 2. Internal anatomy of a crayfish 1. 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). 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