1 / 12

Phylum Chordata

Phylum Chordata. SBI 3U October 29 th , 2012. What are Chordates?. Chordates are animals with a nerve cord, notochord and gill slits (at least at some point in their lives). Characteristics of Chordates. Bilaterally symmetrical Ventral heart Body extends past anus into a tail

hue
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 SBI 3U October 29th, 2012

  2. What are Chordates? • Chordates are animals with a nerve cord, notochord and gill slits (at least at some point in their lives)

  3. Characteristics of Chordates • Bilaterally symmetrical • Ventral heart • Body extends past anus into a tail • Nerve cord • Notochord • Gill slits

  4. More about chordates • Most recent group of animals • Make up only about 5% of animal species

  5. What is a nerve cord? • Unique to chordates • Dorsal nerve cord (dorsal=back side) • Found in the embryos of animals within the phylum chordata • NOTthe spinal cord, it is a rod of cartilage • Part of the nervous system

  6. What is a notochord? • A notochord is a skeletal rod made up of cartilage • Found in all embryonic and some adult chordates • In vertebrates  only present during embryonic development

  7. Classification of Chordates • Three subphyla: Cephalochordata, Urochordata and Vertebrata • Cephalochordata: such as lancelets • Urochordata: such as tunicates • Vertebrata: such as amphibians, reptiles, birds and mammals

  8. Cephalochorata & Urochordata • Filter-feeding marine organisms • Filter-feeding  pass water over a specialized filtering structure • Have notochords • No backbones or vertebral columns • Transition from invertebrates  chordates • Example: Lancelet (cephalochordata) • Example: Tunicate

  9. Vertebrata • Approx. 95% of all chordates • Presence of vertebrae hollow, cartilaginous, bony structure  protects dorsal nerve cord • Endoskeleton • Large brain protected by skull • Advanced nervous system • Circulatory system • Large coelom  containing vital organs

  10. Development of Appendages • Two pairs of appendages limbs • Improvement of locomotion • One of the defining features of vertebrates • Even snakes have them!

  11. Skull • Anterior skull with a large brain • Supports structures of the face and protects brain Mouse Human Dog

  12. Circulatory System • Ventral heart  pumps blood throughout body  in the process, delivering oxygen throughout

More Related