Fish Bio Review #1

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Fish Bio Review #1
2012-10-07 20:19:51

Review #1
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  1. What is in the superclass agnatha?
    lamprey and hagfish are living representatives
  2. What are the tree characteristics of the phylum chordata?
    • Notochord
    • Hollow, dorsal nerve chord
    • Pharyngeal slits
  3. What types of fishes are in Gnathostoma?
    Jawed fishes
  4. Class Myxini
    Order Myxiniformes -  modern hagfish
  5. Class Cephalospidomorphi
    Order Petromyzontiformes - modern lamprey
  6. ‘Ostracoderm’ includes two important Classes: 
    Class Cephalaspidomorphi = ancestor to lamprey??

    Class Pteraspidomorphi = ancestor to hagfish??

    • Ostracoderms now extinct
  7. Hagfish family
  8. Lamprey family
    Family Petromyzontidae
  9. What classes are found in the superclass Gnathostomata?
    Class Placodermi - plate-skinned (extinct)

    • Class Acanthodii - spiny sharks (extinct)
    • Class Sarcopterygii – lobed-fin fishes

    Class Chondrichthys - sharks, skates, rays

    Class Actinopterygii - ray-finned fishes

  10. What did this animal have on its head and shoulder?
    Dunkleosteus- Head and shoulder girdles with dermal bony plates joined by Craniovertebral joint which allowed it to move.

    Arthrodire- "jointed neck"
  11. What is this and what is it most closely related to?
    Acanthoidian- extict class of fish

    More closely related to modern day bony fish than sharks, even though skeleton was mostly made of cartilage.
  12.    What are some of the features of the
    cladoselachid sharks?
    • Terminal mouth
    •  Fins broad-based and stiff,long radial elements  
    •  No anal find.    
    •  Caudal fin is homocercal    
    • Body supported by notochord only      
    • Often spines in front ofdorsal, pectoral, and pelvic
  13. Describe some Hybodont Features
    • -Terminal mouth
    • - Fins flexible and mobile
    • -Anal fin     
    • -Caudal fin heterocercal
    • -Body supported by notochord
    • with neural arches
    • - Spines on dorsal fin
  14. What are the four things that the third elasmobranch radiation that allowed improved feeding and locomotion?
    • 1. Jaws: ventral mouth with protrusible upper jaw
    • 2. Dentition: tooth replacement system
    • 3. Fins: ceratotrichia supporting the fins
    • 4. Vertebrae: calcified vertebrae instead of notochord
  15. What are the two subdivisions of Infraclass Euselachii?
    Subdivision Selachii (sharks - 9 Orders)

    Subdivision Batoidea (rays - 4 Orders)