Secrete mucus, reduce drag, slimy Swim bladder to adjust buoyancy to compensate for heavy bone.
Can breath while stationary Largest group of living vertebrates Ichthyology: study of fish
Tetrapods (four footed): land vertebrates Evolved lungs- air breathing
Amphibians: (class Amphibia) Evolved from lobe-finned fish and lung fish 350 mya First vertebrates on land Must reproduce in water Amphibian means two lives, in water as larval stage and on land as an adult Not marine…. Why?
Can not retract head like land based tortoises and turtles
Legs modified into flippers Leave water only to lay eggs Examples: Green, Hawksbill, Loggerhead, Kemp’s Ridley and the Leatherback (largest) Migrate long distances, using wave motion and magnetic field
Birds: (class Aves) Evolved from a reptilian ancestor
Reptilian remnants include: shelled egg and scales on legs Archaeopteryx 150 million year old reptile with feathers, teeth and tail with vertebrate Sea birds have evolved body shape and structure to swim, fly or feed in the ocean