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Phylum Chordata. Subphylum Craniata (Vertebrata). Phylum Chordata, Subphylum Vertebrata (Craniata). Increase in brain size & sensory apparati Derivation of neural crest Enclosure of anterior neural tube in cartilage/bone (neural crest derivative)

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Phylum Chordata

Subphylum Craniata (Vertebrata)


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Phylum Chordata, Subphylum Vertebrata (Craniata)

  • Increase in brain size & sensory apparati

  • Derivation of neural crest

  • Enclosure of anterior neural tube in cartilage/bone (neural crest derivative)

  • Subsequent derivation of cartilaginous vertebrae, bony jaws & cranium

  • Ossification of skeleton & derivation of appendicular skeleton

  • Two superclasses

    • Agnatha – without jaws

    • Gnathostomata – mouth with jaws






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Subphylum (group)

superclass

superclass

Vertebrate Cladistics






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Ammocoete Larvae of Lamprey

  • Filter feeders using pharyngeal slits





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The terrifying development from the terrifying pharyngeal pouches




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Class Chondrichthyes Subclass Elasmobranchii

  • sharks & skates & rays

  • Skates

    • Fleshy tail, 2 dorsal fins, sometimes caudal fin

    • Lay egg case (mermaid’s purse)

  • Rays

    • Narrow tail without fins, with spines






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Chondrichthyes Reproduction

  • Internal fertilization

    • Males have claspers between pelvic fins

  • Reproductive modes

    • Oviparous

      • Fertilized egg is laid

    • Ovoviviparous

      • Egg develops within female and living young are born

      • No placenta or placental structures

    • Viviparous

      • Embryos develop within female and living young are born

      • Some placenta-like structures of maternal origin


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Group Osteichthyes – bony fish

  • Class Actinopterygii – ray-finned fish

    • subclass Neopterygia

    • subclass Chondrostei

  • Class Sarcopterygii – fleshy-finned fish

seahorse

flying fish

grouper

coelacanth

lungfish








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Primitive Bony Fish – Subclass Chondrostei

  • Nonteleost bony fish

    • Heterocercal tail

    • Ganoid scales

    • Lungs

Gar


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Subclass Neopterygia –

  • Teleost

    • Swim bladder

    • Two dorsal fins

    • Homocercal tail

Bass

Tuna

Salmon

Walleye








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