WARM UP What are the four characteristics all chordates share? Draw a sketch of a lancelet, tadpole larva, or fish. Label the four characteristics you listed above.

Fish Notes Phylum Chordata

Fish (and Vertebrate) Characteristics Endoskeleton with vertebrae and limb girdles Bilateral with a torpedo shape – Head, trunk, and tail Two pairs of appendages Circulatory system with chambered heart Spinal cord – Cranial and spinal nerves

Jawless Fish Characteristics – Long, slender bodies – No paired fins

Jawless fish Types – Hagfish Scavengers Mucosal defense – Lampreys Ectoparasites – Sucker mouth with teeth and tongue

Jawed Fish Characteristics – Jaws Ventral or terminal – Paired fins – Scales Placoid or overlapping

Jawed Fish Types – 22,000 species Dominant vertebrate form

Jawed Fish Types – 22,000 species Dominant vertebrate form – Cartilaginous Sharks, skates, rays, chimeras

Jawed Fish Types – 22,000 species Dominant vertebrate form – Bony Ray-finned – 21,000 species Lobe-finned – Lungfish – Coelocanth

WRAP UP List 4 examples of ray-finned fish. List 3 examples of cartilaginous fish. List 2examples of jawless fish. List 1 example of lobe-finned fish.