Facts
Characteristics
100
The two groups of fish in the class Osteichthyes.
What are ray-finned fish and lobe-finnd fish
100
Bony fish have this as opposed to cartilaginous skeletons.
What is bone
200
70 million years ago, everyone believed this type of fish to be extinct.
What is a Coelacanths
200
Some fish can have this for gas exchange.
What are lungs
300
It protects the dorsal nerve chord.
What is the vertebral column
300
Bony fish contain these as their main means of respiration.
What are gills
400
Most fish alive today, including salmon and trout, are this type of fish.
What are ray-finned fish
400
They support the membrane of the fins.
What are spine-like rays
500
The type of fish was thought to be extinct about 70 million years ago, until one was caught in 1938 off the coast of South Africa.
What is the Coelacanth
500
A Tetrapod that lived about 325 million years ago and had fully developed limbs to walk on land.
What is an Ichthyostega
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