Why do we need to classify
There are over 1.4 million different species
of discovered organisms on earth. We
classify them to make studying them
Organisms are divided into five large
groups called kingdoms.
We still find that in each group there may be
organisms that are very different such as ants and
giraffes in the animal kingdom.
That is why each kingdom is divides into smaller groups
called phyla (singular: phylum).
Each phylum is divided into several classes, then a
class is divide into orders, then family, then genus and
finally the smallest group is called species.
Try to remember them using this sentence:
King Philip cut oranges for good students.
Animals are either vertebrates (have a
back bone) or invertebrate (without a
Vertebrates are divided into five classes.
Fish Amphibians Reptiles Birds Mammals
Insects Arachnids Crustaceans Myriapods
Number of legs
Common features They all have: 1. Segmented bodies 2. Jointed legs 3. A hard exoskeleton