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Phyla Hemicordata and Chordata

Phyla Hemicordata and Chordata. BIO 2215 Oklahoma City Community College Dennis Anderson. Phylum Hemichordata. Three body regions Proboscis Collar Trunk Deuterostome Gill slits Open circulatory system Dorsal and ventral nerve cord. Chordates. Phylum Chordata. Phylum Chordata.

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Phyla Hemicordata and Chordata

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  1. Phyla Hemicordata and Chordata BIO 2215 Oklahoma City Community College Dennis Anderson

  2. Phylum Hemichordata • Three body regions • Proboscis • Collar • Trunk • Deuterostome • Gill slits • Open circulatory system • Dorsal and ventral nerve cord

  3. Chordates

  4. Phylum Chordata

  5. Phylum Chordata • Notochord • Gill slits or pharyngeal pouches • Dorsal hollow nerve cord • Postanal tail • Segmented muscles • Deuterostome

  6. Evolutionary Adaptations of Chordates • From filter feeding ancestors to active predators • Mobility • Oxygen capture • Digestion • Circulation • Nervous system

  7. Skeletal Changes • Skeleton becomes stronger to work with bigger muscles • Allows more rapid movement

  8. Oxygen Capture • Gill slit and muscular pharynx will move more water over gills • More oxygen is extracted from water

  9. Circulation • Stronger heart to circulate blood faster

  10. Digestion • Digest more food • Muscularized gut • Digestive glands • Liver • Pancreas

  11. Nervous System • More complex for better • Motor control of body to capture food • Sensory detection of the animals environment • Integration centers (brain)

  12. Hindbrain Midbrain Forebrain Brain With Three Parts

  13. Chordate Subphyla Phylum. Chordata Subphylum. Urochordata Subphylum. Cephalochordata Subphylum. Vertebrata

  14. Sea Squirts

  15. Subphylum Urochordata • Sea squirts • Gill slits (pharyngeal slits) • Notochord • Only in larva • Adult has tunic

  16. Amphioxus

  17. Subphylum Cephalochordata • Amphioxus • Notochord length of body • Dorsal hollow nerve cord • Gill slits • Segmented muscles

  18. Amphioxus

  19. The End

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