b112_Lecture_34a

b112_Lecture_34a - BIOL 112 The Vertebrates Phylum Chordata...

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BIOL 112 The Vertebrates
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Phylum Chordata
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Subphylum Urochordata – Tunicates
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Ciona intestinalis – Sea Vase Tunicate
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Subphylum Cephalochordata
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Branchiostoma (Amphioxus)
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Craniates – Derived Characters
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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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Myxine glutinosa – Atlantic Hagfish
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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
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Petromyzon marinus – Sea Lamprey
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Superclass Gnathostoma - Fishes Hinged jaws Notochord generally replaced by vertebrae in adults Paired appendages
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Class Condrichthyes – Cartilaginous Fishes ~750 extant species of sharks, rays, skates and chimaeras Sharks Streamlined, swift swimmers Suspension feeders or predators Acute black & white vision, can sense electrical fields,
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b112_Lecture_34a - BIOL 112 The Vertebrates Phylum Chordata...

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