1 / 17

Phylum Chordata

Phylum Chordata. Protostome vs. Dueterostome Development Chordates and Echinoderms have deuterostome development, and so are considered related.

cullen
Download Presentation

Phylum Chordata

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phylum Chordata

  2. Protostome vs. Dueterostome DevelopmentChordates and Echinoderms have deuterostome development, and so are considered related.

  3. Objectives: Describe characteristics of phylum Chordata, compare to other phyla. Examine key evolutionary developments within the vertebrates.S4, C4, PO 5: Analyze how patterns in the fossil record, nuclear chemistry, geology, molecular biology, and geographical distribution give support to the theory of organic evolution through natural selection over billions of years and the resulting present day biodiversity. Phylum Chordata • Subphylum Cephalochordata- Lancelets • Subphylum Urochordata- Tunicates • Subphylum Vertebrata • Class Myxini- Jawless fishes • Class Chondrtichthyes- Sharks & Rays • Class Osteithchyes- Bony Fishes • Class Amphibia- Amphibians • Class Reptilia- Reptiles • Class Aves-Birds • Class Mammalia- Mammals

  4. Phylum Chordata

  5. Phylum Chordata • At some point in the lifecycle, all Chordates have : • Dorsal hollow nerve cord • Notochord • Pharyngeal pouches • Post-anal tail

  6. Phylum Chordata

  7. The Notochord allows for more effective movement.

  8. The Notochord allows for more effective movement. • Lancelets are filter feeders with no brain.

  9. Tunicate anatomy

  10. Tunicate Larva- shows chordate characteristics

  11. Dorsal Hollow Nerve Cord • All Chordates have one. • Only sub-phylum vertebrata has a spine.

  12. Dorsal Hollow Nerve Cord • The nerve cord is continuous with the brain.

  13. Pharyngeal Pouches • All Chordates have pharyngeal pouches at some stage in their development.

  14. Pharyngeal Pouches • In some aquatic chordates, such as fish, the pharyngeal pouches become gills.

  15. Pharyngeal Pouches • In humans the pharyngeal pouches become part of our ears, tonsils and thyroid glands.

  16. Post-anal Tail

  17. Post-anal Tail • Remember, some chordates do not have all these features (such as a post-anal tail) as adults, but at some stage in their development.

More Related