328_studyguide_2_2010[1]

328_studyguide_2_2010[1] - Zoology 328 01/26/10 Study Guide...

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Zoology 328 01/26/10 Study Guide 2 If you know the following material, you should do well on the exams. Use the questions to stimulate your thoughts . (The more completely and thoroughly that you answer each question, the more you will gain from the Guide.) Words to Know Arcualia- segmented (cartilage) cranium chondrocranium splanchnocranium dermatocranium cyclostomes agnathans- jawless (not formal grouping) craniata vertebrates exoskeleton endoskeleton extinct – not living extant – still living spiracle phylum species evolution adaptation homology homoplastic in group out group sister group primitive characters plesiomorphic character derived characters apomorphic character synapomorphy- shared apomorphic trait (shared by all ancestors and descendents) Concepts, Functions, Releationships, Interpretations, etc. Describe a larval lamprey. Which non-craniate does it most resemble? Called ammocetes. Looks like amphioxis What groups of animals are considered the agnathans? What characteristics do they share? Answer the same questions for cyclostomes? Agnathans are no jaws Why was the evolution of a muscular mouth and pharynx significant in vertebrate evolution? Allows for feeding
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Describe the skeleton in lampreys. How do larval lampreys feed? How do adults? Of what are their teeth composed? Trace the path of water during respiration in feeding larval and feeding adult lampreys. Why are lampreys of economic significance? Invading great lakes Why is the lamprey larva of evolutionary interest? What is it called? Called ammocetes- looks like amphioxis Use of the term “Craniata” is relatively new. The Phylum Chordata, until quite recently, was composed of the three subphyla – the Urochordata, Cephalochordata and Vertebrata. Today, the terms “Craniata” and
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328_studyguide_2_2010[1] - Zoology 328 01/26/10 Study Guide...

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