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Phylum Chordata. The chordates. Five Chordate Hallmarks. Notochord – flexible rodlike structure; extending length of body. Five Chordate Hallmarks. Dorsal tubular nerve cord. Five Chordate Hallmarks. Pharyngeal pouches and gill slits. Five Chordate Hallmarks.

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phylum chordata

Phylum Chordata

The chordates

five chordate hallmarks
Five Chordate Hallmarks
  • Notochord – flexible rodlike structure; extending length of body
five chordate hallmarks3
Five Chordate Hallmarks
  • Dorsal tubular nerve cord
five chordate hallmarks4
Five Chordate Hallmarks
  • Pharyngeal pouches and gill slits
five chordate hallmarks5
Five Chordate Hallmarks
  • Endostyle or thyroid gland – secretes mucous that traps food particles in pharyngeal cavity
five chordate hallmarks6
Five Chordate Hallmarks
  • Postanal tail – tail extends beyond anus
sixth chordate feature
Sixth Chordate Feature
  • Ventral Heart – heart located ventrally
higher classification of chordata
Higher Classification of Chordata
  • Phylum Chordata
    • Subphylum Urochordata – tunicates, sea squirts
    • Subphylum Cephalachordata – lancelets
    • Subphlum Vertebrata- vertebrates
subphylum urochordata

Subphylum Urochordata

Sea Squirts or Tunicates

urochordate characteristics
Urochordate Characteristics
  • Have a non-living tunic
  • Most chordate features found in the free living acidian larva
  • Adults sessile filter feeders
cephalochordate characteristics
Cephalochordate Characteristics
  • Notochord and nerve cord found along entire length of body, persists throughout life
  • Fish-like in form
    • Includes the lancelets (amphioxus)
subphylum vertebrata

Subphylum Vertebrata

The Vertebrates

vertebrate characteristics
Vertebrate Characteristics
  • Bony or cartilaginous vertebrae surrounding spinal cord
  • Notochord only in embryonic stages, persisting in some fishes
  • Two superclasses according to presence of jaws
vertebrate higher classification
Vertebrate Higher Classification
  • Superclass Agnatha - without jaws
    • Class Myxini – hagfishes
    • Class Cephalaspidomorphi – lampreys
  • Superclass Gnathostomata – with jaws
    • Class Chondrichthyes – sharks, rays, chimaeras
    • Class Actinopterygii – ray-finned fishes
    • Class Sarcopterygii – lobe-fin fishes
    • Class Amphibia – frogs, salamanders
    • Class Reptilia – snakes, lizards, crocodiles
    • Class Aves - birds
    • Class Mammalia - mammals