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Bio1AL_Fa09_lab1_wksht_answers - Chordate Diversity...

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A3 – Fall 2009 Chordate Diversity Worksheet . Due at the end of lab. Name GSI & Sect # Station # This worksheet forms part of the basis for the questions that will appear on the lab exam. In addition you should know information provided by your GSI. Enjoy, but do not torment, the live animals. Think about the big picture and focus on how these animals survive and reproduce in their natural environments. You do not need to proceed in numerical order through the stations, although they are organized so that you can do so. Mammals and bird questions are towards the end of the worksheet, and are located in 2097 VSLB. You should look at the marine tank in both rooms (2095 & 2097 VLSB) as it will form the basis of station 30 on your lab exam. Subphylum: Urochordates (tunicate) -- make a drawing (on the left). Subphylum: Cephalochordates (Lancelet) -- make a drawing (on the right). FISHES (jawless fish: Myxini and Petromyzontida Jawed fishes: Chondrichthyes, Actinopterygii, Sarcopterygii) The study of fish is called ichthyology. STATION ONE: FISH DIVERSITY 1A. Which of the extant groups of fish possess jaws? Chondrichthyes, Actinopterygii and Sarcopterygii. The Myxini and the Petromyzontida lack jaws. 1B. What are two major difference between the sharks (Chondrichthyes) and the other jawed fishes (Actinopterygii and Sarcopterygii)? Skeletal difference = Chondrichthyes have a cartilaginous skeleton Modification of the gastrointestinal tract = Chondrichthyes lack a swim bladder Chondrichthyes have a cartilaginous skeleton (also, no swim bladder, placoid scales, wing like pectoral fins, scalelike teeth, blood with lots of urea, etc) whereas osteichthyes have bony skeletons and a swim bladder.. STATION TWO: SKELETAL SYSTEM 2. How do the vertebrae of terrestrial tetrapods differ from the vertebrae of fish? Look carefully at the interaction of one vertebra with the adjacent vertebra! Fish lack interlocking processes (due to buoyancy of water) whereas vertebrae of terrestrial animals are bulkier, stronger and interlock in comparison to animals of equal dimensions.
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A4 – Fall 2009 STATION THREE: FISH JAWS 3. How do the teeth of Chondrichthyes (SHARKS) differ from those of a ray-finned fish? Elasmobranch teeth are modified scales that are continuously shed and replaced. There are also more rows of teeth present. Name a vertebrate group that lacks a jaw. Petromyzontiformes (Lampreys) STATION FOUR: LOCOMOTION 4A. What is a homocercal tail?
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Bio1AL_Fa09_lab1_wksht_answers - Chordate Diversity...

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