1/25/09 Notes - 1/25/09 Respiration: water- when feeding,...

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1/25/09 Respiration: water- when feeding, water o in and out through gill openings o (gill pouches lined w/ gill filaments “tidal respiration” Endoskeleton - Internal o Cartilage, but no bone Loss may be secondary o Notochord No vertebrae around notochord o Arcualia: segmented Little bits of cartilage Lie laterally to nerve cord and notochord Homologous to vertebrae? o Economic impact in the Great Lakes is huge Welland Canal -1929 By 1946, lampreys in L. Superior Destroyed fisheries…coming back Ammocoetes: larval lamprey o Greater cephalization than amphioxus 3 part brain (anterior end of nerve cord) Sense organs: light receptors, otic (hearing) vesicles, olfactory sac o Muscles and gills associated with pharynx o Heart o BUT the two are still very alike Hagfish : Myxini “Nasal Slime”
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Marine Jawless agnathans Cyclostomes (round mouth) Bottom-feeding scavengers Small, soft invertebrates Short, tentacle-like papillae around mouth 2 rasping plates
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This note was uploaded on 02/14/2009 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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1/25/09 Notes - 1/25/09 Respiration: water- when feeding,...

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