PHYLUM CHORDATA Dorsal Notochord-long rod that supports the body- becomes the vertebrae in most. Dorsal Nerve cord-becomes the central nervous system.
Fishes Zoology Report
Silurian- Devonian Periods
Nonvertebrate Chordates, Fishes, and Amphibians Biology I: Chapter 30.
Diversity of Fishes III. Phylum Chordata –Superclass Agnatha Class Pteraspidomorphi † Class Myxini (?) Class Cephalaspidomorphi –Superclass Gnathostomata.
The Fishes: Vertebrate Success in Water Chapter 18 The Fishes: Vertebrate Success in Water Chapter 18.
The Fishes: Vertebrate Success in Water
