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3. A Terrestrial Arthropod: the grasshopper Daphnia is an aquatic arthropod. Now we will look at an example of a terrestrial arthropod, the grasshopper, which is a member of the largest group of arthropods, the insects. Insects are the most successful group of animals and are found worldwide, in both freshwater and terrestrial environments. rockedure serverof the class loserss have three main body regions the head the thorax (which were less wings), and the abdomen. Look closely at the abdomen. Along its length you should be able to find the spiracles, tiny pin-hole opening Section 1. of a different OpenStax textbook for comment was The head of the grasshopper contains sensory structures, such as the eyes and the antennae. Grasshoppers have two compound eyes and three simple eyes (ocelli) between the compound eyes. The ocelli do images like the compound eyes do, but do sense light. grasshopper's wine you can find the tympanum, an oval structure on each side of the abdomen, near the thorax. These are stimulated by sound waves and function as the grasshopper's ears. Complete the following: 1. Grasshoppers belong to the Domain_ the Kingdom the and the Phylum_ How many embryonic tissue layers do grasshoppers have? 3. What kind of symmetry do they have? 4. What kind of body plan do they have (sac, or tube-within-a-tube)? 5 . What advant vantage do you think a tube-within-a-tube body plan has over a sac body plan? Identify the structures in this drawing ofa Brassstops click inside the table to add the letter of your choice.) Structure Label (A-F) abdomen compound eye spiracles tympanum 7. Using Daphnia and grasshoppers as specific examples, compare how aquatic arthropods ods accomplish gas exchange, and explain why each method is appropriate for the environment in which the animal lives: Part 4. Phylum Chordata: Lancelets, Tunicates, Hagfish, and Us Our own phylum, Chordata, is distinguished adults, possess the following characteristics: and often the a dorsal, hollow nerve cord 3) pharyngeal slits 4) and a muscular, post-anal tail. Phordate These chordate features may not be obvious in the adult bodies of vertebrates such as ourselves, but they are visible in the early embryo forms, as indicated in the following figure. There are three types of invertebrate chordates that, although they do have those four chordate features, do not develop a backbone. They are the lancelets, the tunicates, and the hagfish. . Identify the four chordate characteristics in the following owing drawing of a lancelet by entering into the table the letter from the figure that corresponds to each structure. Identify the mouth and Chordate Structure Label (A-F) pharyngeal slits dorsal, hollow nerve cord notochord muscular, post-anal tail mouth B. View the videos of tunicates (also known as to believe we humans are in the same phylum as Excurrent An adult tunicate Tunicates are filter feeders, and so are sponges. Both types of animals take water into their bodies and then release it back out into their environment, but they do it in very different ways. Ise the videos in the Materials folder to compare how these animals each accomplish filter feeding, and riefly describe here the basic differences you see, including the structures involved C. and how the food particles are captured . Female grasshopper . . . Head Thorax Abdomen tympanum forewing simple eye compound hindwing eye ovipositor antenna spiracles- air sac spiracle tracheae