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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

Phylum Chordata

Subphylum Craniata (Vertebrata)

phylum chordata subphylum vertebrata craniata
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
slide7
Subphylum (group)

superclass

superclass

Vertebrate Cladistics

ammocoete larvae of lamprey
Ammocoete Larvae of Lamprey
  • Filter feeders using pharyngeal slits
class chondrichthyes subclass elasmobranchii
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
chondrichthyes reproduction
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
group osteichthyes bony fish
Group Osteichthyes – bony fish
  • Class Actinopterygii – ray-finned fish
    • subclass Neopterygia
    • subclass Chondrostei
  • Class Sarcopterygii – fleshy-finned fish

seahorse

flying fish

grouper

coelacanth

lungfish

primitive bony fish subclass chondrostei
Primitive Bony Fish – Subclass Chondrostei
  • Nonteleost bony fish
    • Heterocercal tail
    • Ganoid scales
    • Lungs

Gar

subclass neopterygia
Subclass Neopterygia –
  • Teleost
    • Swim bladder
    • Two dorsal fins
    • Homocercal tail

Bass

Tuna

Salmon

Walleye

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