Anatomy of a Crayfish . 2. Crayfish, any of numerous crustaceans constituting the families Astacidae, Parastacidae, and Austroastracidae. 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 … Encephalon: site of the mental functions of a crayfish. Stomach: part of the digestive tract between the esophagus and the intestine. Over half of the more than 500 species occur in North America. Place a crayfish on its side in a dissection tray. Locate the dorsal tubular heart and several arteries. Cool Science Experiments Science For Kids Science Projects Life Science Science And Nature Science Biology Conversation … Gonad: sex gland of a crayfish. They are closely related to the lobster. Internal anatomy of a crayfish: edible freshwater crustacean, with pincers on the two forelegs. APPENDIX B Dissection Guide: The Crayfish This handout is a stepwise description of how to dissect a crayfish. Within this kingdom are subgroups, known as phyla. In this Biology lab, we will take a close look at the external and internal anatomy of a freshwater aquatic invertebrate—the crayfish. Abdomen - The abdomen is the segmented tail area. Use the diagram of the internal anatomy of the crayfish to locate and identify the organs of the circulatory system. *Check the box next to the number when you have completed that step. INTERNAL ANATOMY: The diagram below displays the crayfish with the carapace carefully removed exposing the underlying gills and other organs. Nearly all live in fresh water, although a few species occur in brackish water or salt water. Locate the dorsal tubular heart and several arteries. They are labeled as Pleo-pods I. You may want to review or reference terms you don't ... diagrams to help you locate the organs. Carapace - The protective shell (exoskeleton) of the cephalothorax. The crayfish has an open circulatory system in which the blood flows from arteries into sinuses, or spaces, in tissues. Introduction: Crayfish belong to the Kingdom Animalia which includes all organisms that must consume their food (heterotrophs) and are multicellular. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This structure is illustrated in the individual species.accounts. 47. Cephalic groove an indentation in the carapace between. Female crayfish lack gonopods and between Pereiopods V (fifth pair of legs) is found the annulus ventralis. The crayfish belongs to the Phylum Arthropoda, which includes organisms that have an … Extensor muscles: muscle that extends the tail of the crayfish. Internal Anatomy of the Crayfish Directions: Follow the directions step-by-step, locating each of the structures in the order they appear in the directions. It has been our experience that manuals typically illustrate some anatomical structures very well and others, not so well. Internal anatomy of a crayfish 1. Crayfish Diagram Labeled. Crayfish Diagram Labeled. Saved by Elizabeth Angelo. The blood flows over the gills before returning … The crayfish has 8 jointed walking legs a segmented body 2 pairs of sensory antennae and compound eyes. eralized crayfishdrawing. When examining the chelae structure of a crayfish all characters are observed from the … Labeling: Crayfish External Anatomy Read the definitions below, then label the crayfish diagram. Use the diagram below to locate the cephalothorax and the abdomen.The carapace, a shield of chitin, covers the dorsal surface of the cephalothorax.On the carapace, observe an indentation, the cervical groove, that extends across the midregion and separates the head and … Heart: blood-pumping organ of the crayfish. The swimmerets, telson, and uropods are attached to the abdomen. 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