Kingdom Animalia classification

Kingdom animalia classification

level of organization

Cellular

Tissue

1. Porifera

true coelom present

Pseudocoelom present

No coelom between epidermis and gastrodermis

4. Nematoda

Body billateral

Body radial

2. Coelentrata

3. platyhelminthes

Mesodermal cells formed from a single cell during growth of embryo

Endoderm gives rise to coelom

6. Arthropoda

5. Annelida

7. mollusca

Notochord absent

Notochord present

Intermediate characters

8. Echinodermata

9. Hemichordata

10. Chordata

Notochord present in atleast larval forms but very rudimentary

Notochord replaced by vertebral column in adults

Protochordata

Vertebrata

Exoskeleton of scales, laying eggs outside the water

Gills in larva, lungs in most adults

Exoskeleton of scales, endoskeleton of bone

Exoskeleton of feathers, lay eggs outside the water, flight possible

Exoskeleton of hair, external ears, mostly give birth to young ones

Pisces

Amphibia

Reptilia

Aves

Mammalia

These animals are sedentary and remain attached to the stones and rocky bottom of the sea. Theyare radially symmetrical.

They are the first multicellular organism of this planet.

They all occur in marine water with the exception of members of family spongillidae which are aquatic.

Their body is perforated by numerous ostia while anterior end possesses a large opening known as oscullum.

Vegetative, asexual and sexual reproduction take place.

They are all aquatic, solitary or colonial organisms.

They are diploblastic with tissue level of organization.

The body has a single cavity called coelenteron with only one opening. The mouth is meant for taking food and throwing out waste. The mouth bears slender processes called tentacles.

These are dorsiventrally flattened organisms without segmentation.

They are triploblastic and acoelomate organisms.

They have flame-cells for excretion

Digestive cavity with a single opening.

They are mostly parasitic.

Digestive tract is complete with mouth and anus.

It is pseudo coelomate.

They are mostly parasitic.

The body is metamerically segmented with external transverse grooves and internal septa.

Alimentary canal is complete.

They are true coelomate animals.

There are definite organs, so they have organ level of organization.

The body is normally divided into three parts: head, thorax and abdomen.

Each body segment usually bears one pair of jointed appendage.

True coelom is absent and haemocoel is present which is formed by the union of blood vessels.

Alimentary canal is complete

The blood vascular system is open type.

Respiration takes place by gills, trachea or book lungs.

Body is very soft and unsegmented.

These animals are triploblastic.

Some animals are asymmetrical due to occurrence of torsion.

The coelom is very small and not much spacious.

Organ systems are well developed.

Blood vascular system is well developed and has a soft, dorsal heart.

Tube feet facilitate the locomotion, respiration and food capturing.

Alimentary canal is coiled.

Excretory organs are not found.

they are unisexual.

Fertilization is internal.

Development may be direct or indirect.

Notochord is absent and if present then situated in anterior region only.

Gill slits are found in the pharynx.

A dorsal tubular nerve cord is present.

Blood vascular system is closed and composed of blood vessels only, no heart is found. Blood circulation is like that of earthworms.

Gill slits are found in the pharynx.

A dorsal tubular nerve cord is present.

Blood vascular system is closed and composed of blood vessels only, no heart is found. Blood circulation is like that of earthworms.

The animal body is mostly divided into four regions – head, neck, trunk and tail.

There are two pairs of appendages.

The notochord is partly or fully replaced by a jointed vertebral column in the adult.

They are triploblastic and coelomate.

They have dorsal nerve chord and gill pouches.

The subphylum vertebrata is further divided into classes.

This class includes fishes. They are exclusively aquatic. Fishes may have bony or cartilaginous skeleton. They have fins and tail for locomotion. Respiration is by gills. Their heart is two chambered and they lay eggs.

This class includes amphibians or the animals that live both on land and in water.

These are the vertebrates fully adapted for life on land.

All birds fall in this category

They are terrestrial vertebrates. They are found in all sorts of habitats from the polar region to the tropics.