Chordata (A+ Graded)

5 chordate characteristics correct answers 1. Notochord (replaced by vertebral column in vertebrates) 2. Dorsal (hollow) nerve cord 3. Pharyngeal slits 4. Post-anal tail 5. Endostyle Notochord correct answers sits below the dorsal hollow nerve cord, can bend side to side but cannot be compressed, helps with movement (especially swimming) Pharyngeal slits correct answers A gill structure in the pharynx that allows for filtration of water and food from the environment Endostyle correct answers Ciliated cells that produce a mucus sheet used to trap food particles and concentrate iodine Dorsal Hollow Nerve Cord correct answers nerve cord found in all chordates that forms the spinal cord and brain Post-anal tail correct answers a tail that extends beyond the anus Segmentation correct answers the division of the body of an organism into a series of similar parts Cephalization correct answers the concentration of nerve tissue and sensory organs at the anterior end of an organism Protochordate correct answers primitive invertebrate chordates: tunicate, lancelet, acorn worm Hemichordate correct answers A group of organisms representing the closest relatives of chordates and invertebrates. Enteropneusta correct answers acorn worm that uses the proboscis for locomotion and feeding ("gut breather") Pterobranchia correct answers in class of hemichordata, live in secreted tubes in ocean waters. small and colonial. each member is called a zooid. Sessile. ("wing gill") Cephalochordata correct answers lancelets (amphioxus) that have myomeres, buccal cirri Branchiostoma correct answers gill mouth Urochordata correct answers tunicates & sea squirts, create tunicin and have all 5 chordate characters in larval stage