| Definition:
Vertebrate animals are the most complex members
of the Phylum:Chordata, called higher chordates. Fish (four classes), amphibians,
reptiles, birds, and mammals are vertebrates. |
|
 Structure:
Chordates have in common at some stage of life, the presence of a notochord,
a nerve cord, gill slits, and a tail. Strong, flexible backbones, and complex
organ systems permit vertebrate
animals to live in a variety of environments. They are bilaterally
symetrical, and have appendages of some type, either fins, wings, or
legs. Their main sensory control system
is located centrally inside the head in the brain.
Vertebrates have a closed circulation,
and a coelomic cavity where most of the organs lie. An endoskeleton
supports pectoral and pelvic
girdles to which the upper
and lower extremities are attached. Vertebrates
with four legs are called tetrapods.
 Function:
Vertebrates were able because of their complex organ
systems, particularly their musculoskeletal
system, to free themselves from restricted environments.
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