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Kingdom Animalia has approximately 36 sub-divisions known as 'phyla'. Each phyla share particular properties structurally and functionally which together separate it from other phyla. Below are the most common phyla classified under traditional biological  methodology.
Phylum Porifera - They are primitive organisms, most of them are salt-water sponges. They do not have organs or nerve cells or muscle cells. Approximately, 8,000 species exist today. Example: Sycon, Euspongia, Spongilla.
Phylum Coelentrata (Cnidaria) - This group is composed of jelly-fish and other lower aquatic animals. Approximately, 15,000 species exist today.Example: Aurelia, Adamsia.
Phylum Platyhelminthes - This group consists of flat worms. They inhabit both marine and fresh water habitats and they are mostly endoparasites found in animals. Example: Taenia, Fascicola.
Phylum Aschelmeinthes - It is a group of round worms, most of them are parasites. This phylum consists of about 80,000 parasitic worms.
Phylum Annelida - They are present in aquatic, terrestrial and are free-living or parasitic in nature. This phylum comprises of segmented worms. Example: Earthworm, Leech etc.
Phylum Arthropoda - This is the largest phylum which consists of insects. There are over 1 million species of insects existing today. Example: Locusts, Butterfly, Scorpion, Prawn.
Phylum Mollusca - It is the second largest phylum. They are terrestrial and aquatic. Example: Pila, Octopus.
Phylum Echinodermata - This consists of sea stars and sea urchins. There are about 6,000 species. Example: Asteria, Ophiura.
Phylum Chordata - Animals of this phylum have a characteristic feature of presence of notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. Within this phylum advanced group called vertebrates which include fish, amphibians, reptiles, birds and mammals