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Phylum Chordata (Part 2)

Phylum Chordata (Part 2). SBI 3U. Subphyla: Vertebrates vs. Invertebrates. Invertebrates: urochordata and lancelets  only notochord and nerve cord Vertebrates: largest group of chordates. Notochord  backbone. Nerve cord  spinal cord. Superclasses of Invertebrates. Agnatha

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Phylum Chordata (Part 2)

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  1. Phylum Chordata (Part 2) SBI 3U

  2. Subphyla: Vertebrates vs. Invertebrates • Invertebrates: urochordata and lancelets  only notochord and nerve cord • Vertebrates: largest group of chordates. Notochord  backbone. Nerve cord  spinal cord

  3. Superclasses of Invertebrates • Agnatha • Chondrichthyes • Osteichthyes • Amphibia • Reptilia • Aves

  4. Superclass: AgnathaJawless Fishes • Lampreys & hagfish • Slimy skin & lack paired fins • Skeleton made up of cartilage • Lampreys  external parasites • Hagfish  scavengers

  5. Superclass: ChondrichthyesCartilaginous Fish • Sharks, skates and rays • Cartilaginous skeleton • Biting jaws & paired fins • Shark  successful animal. Streamlined body and fins enhance stability

  6. Superclass: OsteichthyesBony Fish • Most numerous vertebrates • Many kinds: trout, salmon, cod, perch, sole, eel, halibut & tuna • All have gills • Body covered with flat, flexible scales • Blood pumped through a 2-chambered heart

  7. Superclass: AmphibiansFrogs, Toads & Salamanders • Two lives – not literally! • Spend early part of life in water and rest on moist habitat

  8. Superclass: Reptilia • Crocodiles, alligators, turtles, tortoises, lizards and snakes • Thrive in terrestrial environment and some moved into arid regions • Developed a tough skin that restricts water loss and kidneys that can excrete highly concentrated urine to conserve water

  9. Superclass AvesBirds • Scales on legs, large-yolked eggs • Generate their own body heat and maintain a high, relatively constant body temperature • Feathers • Hollow bones

  10. Superclass: Mammalia • Body covering of hair • Four chambered heart • Specialized teeth • Mammary glands

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