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(4) Fishes1 - Vertebrates Chordate characteristics...

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Vertebrates Chordate characteristics Integument - epidermis and dermis Endoskeleton - limb girdles Many muscle Complete GI tract Ventral heart, closed circulation, RBC’s with Hb, 2 circuits Well-developed coelom Paired kidneys Brain with 10 - 12 prs. Cranial nerves, Endocrine system Separated Sexes Body plan - Head, Trunk, Post anal tail
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Fishes Fishes “Gill-Breathing, Ectothermic, Aquatic Vertebrates with Paired Fins and Skin with Scales”
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Fishes Fishes Agnathans Gnathostomes Ostracoderm, Hagfishes Lampreys - filter feeders - scavengers - parasites - no vertebrae Jawed Fishes Tetrapods - jaws = modification of 1st 2 gill arches - paired appendages
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Superclass Agnatha Superclass Agnatha 84 species; most primitive fishes Jawless, eel-like body No bones, no scales, No paired fins Pore-like gills 2 Groups: Hagfishes and Lampreys
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Hagfishes - “slime eels” Hagfishes - “slime eels” Marine Scavengers Keen smell and touch Live in burrows on bottom Rasping tongue Enormous quantities of slime NOAA/Ocean Explorer
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