Phylum containing animals that have a spinal cord, notochord, pharyngeal pouches, and a tail at some point in their lives.
Long, supporting rod that runs through the body and protects the nerve cord; develops into a spinal cord in most chordates.
Paired structures in the throat region and resemble gills.
Subphylum of organisms that have a supporting structure known as a vertebral column or backbone that houses the spinal cord.
Subphylum of filter feeding, soft bodied, marine invertebrate chordates like tunicates.
Subphylum of fish-like invertebrate chordates like lancets.
Aquatic vertebrates, most of which have paired fins, scales, and gills.
A thin-walled sac that collects blood from a fishís veins.
Large chamber that carries blood to the ventricle in a fishís heart.
Thick-walled muscular chamber that is the pumping portion of a fishís heart.
Tube that carries blood to the gills from the heart of a fish.
Lateral line system
Sensory receptors that can detect currents and vibrations from the water surrounding a fish.
An internal, gas-filled organ that allows fish to adjust their buoyancy.
Part of a fishís brain that controls voluntary muscle movement.
Part of a fishís brain that coordinates muscle movements
Part of a fishís brain that controls the functions of internal organs.
Fishes whose eggs hatch outside of the motherís body.
Fishes whose eggs stay in the motherís body after internal fertilization and young are born alive.
Fishes whose young obtain nourishment from the motherís body, not from the yolk of the egg, and are born alive.
Class of fish containing lampreys.
Class of fish containing hagfishes.
Class of cartilaginous fish, includes sharks and rays.
Class of bony fish that contains ray and lobe finned fishes.
A vertebrate that lives in the water as a larva and on land as an adult.
The end of an amphibianís digestive tract; also the cavity through which digestive wastes, urin, and eggs or sperm leave the body.
Part of an amphibianís heart that receives oxygen-rich blood from the skin and lungs.
Part of an amphibianís heart that receives oxygen-poor blood from the body.
Part of an amphibianís heart that pumps blood to the rest of the body.
Extension of the ventricle in an amphibianís heart that divides the oxygen-poor and oxygen-rich blood supply.
Transpartent eyelid that protects an amphibianís eyes when out of the water.
Eardrums located on the side of an amphibianís head that allows them to hear.
Order of amphibians that includes salamanders and newts.
Order of amphibians that includes frogs.
Order of amphibians that includes caecilians.
4 Characteristics all chordates share
Dorsal, hollow, nerve cord; notochord; pharyngeal pouches; tail
Humans have no tail, how are they still chordates?
The characteristics need to only be present at some time in the animal's life. Most humans have a tail for only a short time (1-6 weeks) during gestation.
Two traits fish evolved to be successful
Jaws used for food and defense and paired fins for fast and accurate locomotion
Three adaptations that allowed amphibians to live on land
Stronger bones, lungs, a sternum
Why oxygen/CO2 transport is less efficient
Amphibian hearts only have one ventricle, so there is some mixing of oxygen-rich and oxygen-poor blood.