LAB: Craniates Part 1 Flashcards Preview

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Flashcards in LAB: Craniates Part 1 Deck (9)
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1

Craniates

  • Have a cranium (skull)
  • Additional Characteristics:
    • improved musculature
    • 2+ chambered hearts
    • Red blood cells
    • O2 transporting hemoglobin
    • kidneys

2

Hagfish (Myxini)

  • Are marine scavengers
  • Produce mucus for protection
  • round mouths

3

​Vertebrates

  • Craniates with vertebral column (backbone)
  • most are gnathostomes (jaws)
    • lateral line system - pectoral, pelvic fins
    • complex brain

4

Lamprey (Petromyzontida)

  • most are parasitic as adults
  • lack jaws (agnathan)

5

Cartilaginous fish (Chondrichthyes)

  • Have an endoskeleton made of cartilage
  • Include:
    • Sharks
    • Rays
  • Teeth are modified scales

6

Bony Vertebrates (Osteichthyans)

  • have an endoskeleton of ossified bone
  • two groups:
    • Ray-finned fish
    • Lobe-finned fish

7

Ray-finned fish

  • Greatest diversity among vertebrate groups
  • have fins of bony elements known as rays

8

​Lobe-finned fish

  • Thick fins
  • two extant groups
    • Coelacanths
    • Lungfish
  • 3rd group evolved into tetrapods

9

Ray-Finned Fish ANATOMY