PHYLUM CHORDATA

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PHYLUM CHORDATA

• THREE COMMON CHARACTERISTICS
• I. NOTOCHORD a cartilage support
• rod sometime during development.
• II. DORSAL NERVE CORD central nerve or spinal
  cord along the back.
• III. PHARYNGEAL GILL SLITS Pharynxthroat
  region, some time during development (embryo)

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SUBPHYLUM UROCHORDATA

• CLASS ASCIDIA Sea squirts
• sessile filter feeders on dock floats
  and dock pilings.
• CLASS THALIACEA Tunicates
• colonial, sessile and pelagic filter feeders
• Salps, pelagic,
  transparent barrel shaped filter feeders.

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SUBPHYLUM CEPHALOCHORDATA

• LANCELETS Amphioxus, small fish like ancestors
  of vertebrates.
• Filter feeders living in sandy bottoms.

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SUBPHYLUM VERTEBRATATHE VERTEBRATES

• VERTEBRAL COLUMN of bone or cartilage.
• SKULL enclosing brain etc.

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CLASS AGNATHAThe Jawless Fishes

• LAMPREYS salt and freshwater parasites on other
  fishes.
• HAGFISH deeper water scvengers and parasites.

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Lamprey
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