Phylum Chordata Subphylum Vertebrata Marine Vertebrates I Phylum Chordata Subphylum Vertebrata

Characteristics of Vertebrates Backbone- vertebral column Encloses the dorsal nerve cord (spinal cord ) Bilateral symmetry Endoskeleton Marine Fishes- 3 major groups Jawless Fish Cartilaginous Fish Bony Fish In Biology- page 712-713 Vertebrae are individual segments that make up the backbone. The vertebral column surrounds and protects the dorsal nerve cord. Define DORSAL Define bilateral symmetry compared to spherical and radial symmetry

Class Agnatha- Jawless fish https://www.youtube.com/watch?v=bqk0mnMgwUQ

Hagfish Lack Jaws Lack paired fins Lack scales Lack true bones Bottom dwellers Secrete thick slime

Lamprey https://www.youtube.com/watch?v=9JQ6oHjpeqU

Lampreys Mostly fresh water fish Anadromous life cycle- hatched in fresh water, migrate to salt water, and return to fresh water to reproduce. Parasites of bony fishes

Class chondrichthyes