Vertebrates Mr. Skirbst Life Science Topic 17

Phylum Chordata

-Includes all vertebrates

Phylum Chordata -Includes all vertebrates -Vertebrate – animal that has a backbone (vertebral column)

3 Characteristics -(at some point in their development)

3 Characteristics -(at some point in their development)

3 Characteristics 1- Nerve cord – hollow tube near back

3 Characteristics 1- Nerve cord – hollow tube near back 2- Notochord – long, flexible support rod (vertebral column)

3 Characteristics 1- Nerve cord – hollow tube near back 2- Notochord – long, flexible support rod (vertebral column) 3- Throat with gill slits (debatable)

8 Groups of Chordates

6 Groups of Ectotherms “coldblooded” body temp. = outside temp.

8 Groups of Chordates 2 Groups of Endotherms “warmblooded” body temp. = constant

Fish Water-dwelling vertebrates that have: 1- scales 2- fins 3- gills

3 main groups of fish 1- jawless – primitive, lack jaws (ex. Lamprey + hagfish)

3 main groups of fish 2- cartilaginous – no “bones” Skeletons made of cartilage (ex. Sharks & rays)

3 main groups of fish 2- cartilaginous – no “bones” Skeletons made of cartilage (ex. Sharks & rays) Sharks reproduce internally and must move gill slits to breathe

3 main groups of fish 3- bony – skeletons of bone (ex. Trout & perch) * also have swim bladders