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animalia

Bharatiya vidya bhavan,

Middle east

BHARATIYA VIDYA BHAVANMiddle East. All rights reserved


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Kingdom Animalia

Basis of classification:

Body symmetry

Nature of coelom

Diploblastic and triploblastic

organisation



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Body symmetry

Asymmetrical: any plane that

passes through the centre

does not divide them into twoequal halves.

Eg.Sponges



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Radial symmetry

When any plane passing through

the central axis of the body divides

the organism into two identicalhalves, it is called radial symmetry.

Eg. Coelenterata, andEchinodermata.



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Hydra Sea anemone

Star fish Echinus

BHARATIYA VIDYA BHA

VANMiddle East. All rights reserved


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Bilateral symmetryWhen the body can be divided

into identical left and right halves

in only one plane, it is calledbilateral symmetry.

Eg. Annelids, arthropods.



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Butterfly crab

Earth worm Leech



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Diploblastic and

Triploblastic organisation

Animals in which the cells are

arranged in two embryonic

layers , an external ectoderm andan internal endoderm are called

diploblastic animals.

Eg. Coelenterates.



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Those animals in which the

developing embryo has a third

germinal layer ,mesoderm inbetween the ectoderm and endoderm

are called triploblastic animals.

Diploblastic TriploblasticBHARATIYA VIDYA BHAVANMiddle East. All rights reserved


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coelom

The body cavity which is lined by

mesoderm is called coelom.Animalspossessing coelom are called

coelomates.

Eg.annelids, mollusca,arthropods



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In some animals body cavity is not

lined by mesoderm,instead

mesoderm is present as scatteredpouches in between ectoderm and

endoderm. This condition is called

pseudocoelom. Eg.aschelminthes.

BHARATIYA VIDHYA BHAVANMiddle East. All rights reserved


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Animals in which the body

cavity is absent are called

acoelomates.

BHARATIYA VIDHYA BHAVANMiddle East. All rights reserved


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Phylum:Porifera

Non motile animals

Marine ,mostly asymetrical

There are pores all over the body

Have water transport system.water enters

trough small pores in the body wall into a

central cavity.

Body is covered with a hard exoskeleton.

Cellular level of organisation.



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Sycon



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Coelenterata

Aquatic, mostly marine,

Sessile/freeliving,radially

symmetrical animals.Diploblastic,tissue level of

organisation

Solitary/ colonial forms.



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Sea anemone physalia

Coral



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Platyhelminthes

Bilaterally symmetrical,

triploblastic.

Dorsoventrally flattened,

acoelomate.

Mostly endoparasites.Free living

forms are also found.

Organ level of organisation



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Planaria liver fluke

Tape worm


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