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Phylum Chordata

Phylum Chordata. Tunicates Amphioxus. Taxonomic Summary. Phylum Chordata Subphylum Urochordata Subphylum Cephalochordata Subphylum Vertebrata. Subphylum Urochordata. Defining characteristics Notochord and nerve cord are found only in the larval stage

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Phylum Chordata

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  1. Phylum Chordata Tunicates Amphioxus Phylum Chordata

  2. Taxonomic Summary • Phylum Chordata • Subphylum Urochordata • Subphylum Cephalochordata • Subphylum Vertebrata Phylum Chordata

  3. Subphylum Urochordata • Defining characteristics • Notochord and nerve cord are found only in the larval stage • Most of the urochordates are filter feeders Phylum Chordata

  4. Colonial Species Phylum Chordata

  5. Nice Tunic • Soft exoskeleton made of cellulose with 2 external openings • Some species have spicules and toxins in the tunicate Spicules Phylum Chordata

  6. Filter Feeding

  7. Sexual Reproduction • Most colonial species retain eggs and fertilization is internal with development • The larvae are microscopic, short-lived, non-feeding, pelagic tadpoles Phylum Chordata

  8. Subphylum Cephalochordata • Defining characteristics • The notochord extends beyond the nerve cord to the anterior end of the animal • The notochord is contractile, formed as a longitudinal series of flattened discs Phylum Chordata

  9. A Little Ditty It’s a long way from amphioxus, It’s a long way to us It’s a long way from amphioxus To the meanest human cuss Goodbye to tails and gill slits, Hello: nails and hair! It’s a long way from amphioxus But we came from there Phillip H. Pope sing to the tune of “It’s a long way to Tipperary” Phylum Chordata

  10. Anatomy Phylum Chordata

  11. Filter Feeders • Filter feed using a special pharynx similar to tunicates • Slotted pharynx supported by skeletal bars similar to acorn worms Phylum Chordata

  12. Reproduction • Separate sexes with gonads located in the atrial region • Fertilization occurs in the water • Developing young are free swimming propelled by cilia Phylum Chordata

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