Quizlet flashcards, activities and games help you improve your grades. It has 2 large pincers or claws called chelipeds. Cephalic groove an indentation in the carapace between. Anatomy of a Crayfish . Introduction: Crayfish belong to the Kingdom Animalia which includes all organisms that must consume their food (heterotrophs) and are multicellular. PROCEDURE PART 2: Internal Anatomy of a Crayfish. Locate the dorsal tubular heart and several arteries. Phylum Arthropoda, Subphylum Crustacea. Cut along the indentations that separate the thoracic portion of the carapace into three regions. 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. 16. Put on safety goggles. External anatomy of a crayfish. If a crayfish loses a leg, the leg will regenerate (regrow). The crayfish has 8 jointed walking legs a segmented body 2 pairs of sensory antennae and compound eyes. Part 2—Internal Anatomy of a Crayfish 1. 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 … Crayfish Anatomy. 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. Within this kingdom are subgroups, known as phyla. Use a probe to disconnect any muscle stuck to the carapace as it is lifted away. 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: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. 15. 1. Part 2—Internal Anatomy of a Crayfish. 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. 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. 2. 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. Internal anatomy of a crayfish 1. 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