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Lower Chordates and Fish

Across
The study of animals
Extinct armored fish
Marine chordate that is usually found buried in sandy seabeds
Number of chambers in a fish heart
Type of cartilaginous fish with a flat body that flares into fins
Class that includes sharks, rays, and skates
Name for large cetacean or the beginning of the name of the world's largest shark
Kind of circulatory system in bony fish
Kind of fish that usually have swim bladders
Type of fish with jaws, paired fins, and non-calcified skeletons
Down
Predatory chordate that lives in fresh or salt water and attaches to its prey with circular arrays of teeth
The first fish
Type of organism in which the anus forms before the mouth
Class of bony fishes
Class of fish with notochord, but no jaws
The study of fish
Name for chordate with bone-encased nerve cords
Type of chordate with notochord only in larval stage
In bony fish, this flap of tissue covers the gills
The first vertebrates