Kingdom Animalia
Kingdom
Animalia comprises millions of animal species and studying them without a basic
classification may lead to confusion. In addition to this, there are several
new species of animals being constantly discovered. Classification is very
essential for identification, naming and assigning a systematic position to the
newly discovered species. Animal Kingdom is classified mainly based on the
closely resembling characteristic features. Kingdom Animalia is characterised
of eukaryotic, multicellular, heterotrophic organisms. They include about 35
phyla of which 11 are considered as major phyla. Almost 99 percent of animals
are invertebrates or animals without backbone. The remaining represents
vertebrates or animals with backbone. On the basis of the presence or absence
of notochord (vertebral column), animals are also categorised into two major
groups and they are non chordates and chordates.
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