Identification
What is the main characteristic of agnatha?
Jawless or no jaw
a taxonomic class within the subphylum vertebrata: the cartilaginous fish.
Chondrichthyes
The gas-filled sac just above the stomach and intestine that allows bony fish to stay buoyant
What is the swim bladder
The structure that helps Chondrichthyes maintain balance and change direction.
What are pectoral fins?
The 3 types of marine fishes
What is Agnatha, Osteichthyes, and Chondrichthyes.
Class Osteichthyes contains Actinopterygii (i.e., _______-finned fish) and Sarcopterygii (i.e., _______-finned fish):
A gill covering.
What is an operculum?
perch, tuna, salmon, bluegill, sunfish, or any other types of bony fish.
What kind of reproduction is common in Chondrichthyes?
internal fertilization
The gas-filled sac just above the stomach and intestine that allows bony fish to stay buoyant
Swim bladder
Two examples of Agnatha.
What are Hagfish and Lamprey.
the biological ability to detect weak naturally occurring electrical impulses in the environment.
Electroreception
What is the type of body plan (symmetry) in Class Osteichthyes
Bilateral
What is a placoid scale?
Placoid scales reduce drag and protect the body; armor!
Caudal fins are used for ______ and ______.
steering and turning
Two examples of structures that are found in Osteichthyes but not Chondrichthyes.
Bones or Operculum.
Situated on or toward the upper side of the body
Dorsal
What are placoid scales?
Evolutionary modified neuromasts that can detect minute electric potentials
What is ampullae of lorenzini
Senses electrical fields of other animals
Lateral Line
What is the main characteristic of agnatha?
What are jawless fish
Composed of bone, which is a calcium phosphate matrix created by special cells called osteoblasts.
Ossified
How do Osteichthyes reproduce?
Most lay eggs externally; some have internal fertilization
Two examples of Chondrichithyes.
Sharks, rays, skates, chimeras, and dogfish
Before gills are formed, during the embryonic stages they are _______________.
pharyngeal slits