Over the last 400 one thousand million years, vertebrate animals have
evolved a diverse array of adaptations for life on earth. Vertebrate
animals are those with which people are nigh familiar, and are the
animals we most commonly use as food, employ for labor, and adopt
as pets fish, amphibians, reptiles, birds, and mammals.
The biologic classification system
Classification is a dynamic subfield of biology. New experience of
anatomy, genetics and evolutionary relationships often lead to a
rethinking of how antithetical groups of organisms are related. Thus, today fish have been subdivided
into several classes, and in the get on future the group we call reptiles may be besides subdivided.
In the biological system of classification, all organisms are separate into increasingly more detailed
groups (taxa), beginning with the Kingdom and continuing down to the Genus and
Species classifications. The scientific name is created by combining the genus and species
classifications.
How are animals different from
plants? Animals (Kingdom Animalia)
are heterotrophic (they eat other
organisms- dead or alert for sustenance)
and have cells that lack rigid cell walls.
Animals are informally
subdivided into invertebrates and
vertebrates.
in that respect are many phyla that
contain animals classified as invertebrates.
near of the animals classified as
invertebrates include arthropods (insects,
spiders, and crustaceans), molluscs
(squids, octopuses and snails), and many
wormlike phyla.
Chordates. As shown in the supra figure, all
Notochord
Brain
vertebrates are found within the Chordata
phylum. All chordates evolved from an ancestor
that had a pliable rod (called a notochord) along
the dorsal side (back) to provide animation for the
skeleton and muscles. All chordates share a
Anus
common internal carcass plan. There is a dorsal
Mouth
nerve cord; a digestive tract that extends from the mouth to anus;
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