Animalia Kingdom, , heading 1

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Animalia Kingdom


· The organisms, which are eukaryotic, multicellular, and heterotrophic, are categorized as Animalia kingdom.

Animalia Kingdom

· The organisms of Animalia kingdom have no cell-wall.

· Most of animals of Animalia kingdom are mobile.

Classification of Animalia Kingdom

· Based on the extent and type of the body design differentiation, Animalia kingdom classified as −

o Porifera

o Coelenterata

o Platyhelminthes

o Nematoda

o Annelida

o Arthropoda

o Mollusca

o Echinodermata

o Protochordata

o Vertebrata

§ Pisces

§ Amphibia

§ Reptilia

§ Aves

§ Mammalia

· Let’s discuss each of them in brief −


· The literal meaning of ‘porifera’ is the organisms with holes.

· The organisms of porifera are non-motile and attached to some solid support.


· The examples of this group are Sycon, Spongilla, Euplectelia, etc.


· Organisms of coelenterata group live in water.

· The organisms of this group have cavity in their bodies.


· Hydra and sea anemone are the common example of coelenterate.


· The organisms of this group do not have true internal body cavity or coelom; so, they neither have well-developed organs.

· The bodies of organisms of this group are flattened from top to bottom; therefore, they are also known as flatworms.


· Planareia, liverfluke, tape worm, etc., are the typical examples of this group.


· The organisms of nematode have cylindrical body.

· The organisms have tissue, but as such no well-developed body (i.e. no real organ).


· The filarial worms (causing elephantiasis disease), roundworm in the intestines, etc., are the common examples of nematodes.


· The organisms of annelida group live almost everywhere including fresh water, marine water as well as on land.


· Earthworms, nereis, and leeches are the familiar examples of annelida.


· Arthropoda, probably, is the largest group of animals.

· The animals of this group don’t have well defined blood vessels rather there is an open circulatory system.

· The literal meaning of arthropod is jointed legs; so, they have jointed legs.


· Prawns, butterflies, houseflies, spiders, scorpions, etc. are the typical examples of arthropod.


· The organisms of mollusca are invertebrate.

· Most of the organisms of Mollusca group live in water.


· Snails and mussels are the typical example of Mollusca.


· The organisms of Echinodermata have spiny skinned.

· Echinodermata are free-living marine organisms.


· The examples of echinodermata are starfish, sea urchins, feather star, etc.


· The organisms of protochordata are normally marine. E.g. Balanoglossus, Herdemania, and Amphioxus


· The organisms of protochordata show a typical feature of body design, called as notochord; however, it does present there throughout the life.

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