b112_Lecture_34_pt01

b112_Lecture_34_pt01 - 3/3/2008 BIOL112 TheVertebrates...

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3/3/2008 1 BIOL 112 The Vertebrates Phylum Chordata Subphylum Urochordata – Tunicates Ciona intestinalis–Sea Vase Tunicate
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3/3/2008 2 Subphylum Cephalochordata Branchiostoma (Amphioxus) Craniates – Derived Characters Class Myxini Hagfishes Skull composed of cartilage No jaws Not true fish Scavengers, no larvae, all marine 30 extant species, all marine
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3/3/2008 3 Myxine glutinosa – Atlantic Hagfish Class Cephalaspidomorphi Lampreys Considered the “oldest” extant vertebrate. Jawless, rasping tongue Parasitic Only larvae feed in some species Cartilage without collagen ~35 species, marine and freshwater Petromyzon marinus – Sea Lamprey
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3/3/2008 4 Superclass Gnathostoma Fishes Hinged jaws Notochord generally replaced by vertebrae in adults Paired appendages Class Condrichthyes – Cartilaginous Fishes ~750 extant species of sharks, rays, skates and chimaeras Sharks Streamlined, swift swimmers Suspension feeders or predators lateral line system for sound detection Oviparous, ovoviviparous or viviparous Prionace glauca – Blue Shark Sphyrna lewini – Scalloped Hammerhead
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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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b112_Lecture_34_pt01 - 3/3/2008 BIOL112 TheVertebrates...

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