(i) Phylum It is a taxonomic category higher than clan
and lower than kingdom, which consists of more than
one class having some similar correlated characters.
e.g., classes—Aves, Amphibia, Pisces, Reptilia and
Mammalia belong to the phylum—Chordata.
of this phylum have notochord in their body plan.
(ii) Class The category class includes related orders. It is
higher than order and lower than phylum. e.g.,
class—Mammalia has orders—Carnivora, Primata, etc
(iii) Family It is the category higher than genus and lower
than order, which has one or more related genera
having some common features. e.g., Felidae, Canidae,
etc.
(iv) Order It is a taxonomic category lower than class and
higher than family. It consists of one or more related
families possessing some similar correlated characters
that differentiate them from families belonging to Other
orders. e.g., Carnivora, Primata, etc.
(v) Genus It comprises of a group of related species which
has more characters common in comparison to species
of other genera. In other words, genera are aggregates
closely related species. e.g., genus— Panthera has lion
(Panthera leo), leopard (P. pardus) and tiger (P. tigris).