Animal Kingdom

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SÜPËRÇLÅSS TËTRÅPØDÅ

Class

Amphibia

Class Reptilia

Class Aves (Birds)

Class Mammalia

They live in

aquatic &

terrestrial

habitats and

need water for

breeding.

Dry & cornified skin,

epidermal scales or

scutes. (NEET 2013)

Presence of

feather and beak.

Forelimbs are

modified into

wings.

Presence of

mammary glands

(milk producing

glands).

Body has head

& trunk. Some

have tail.

Moist skin

without scales.

Most have 2

pairs of limbs.

Snakes and lizards

shed their scales as

skin cast. Limbs- 2

pairs (if present).

Crawling mode of

locomotion.

Dry skin without

glands except

the oil gland at

the base of the

tail. Hind limbs

have scales and

are modified for

walking, swimming

or clasping tree

branches.

Long, hollow,

pneumatic bones.

Skin with hair.

2 pairs of limbs

for walking,

running, climbing,

burrowing,

swimming or flying.

Tympanum

represents ear.

Tympanum

represents ear.

Tympanum

represents ear.

External ear

(Pinnae).

3-chambered

heart

(2 auricles + 1

ventricle).

3-chambered heart

(but a septum

partially separates

ventricle). Heart is

4- chambered in

crocodiles.

Heart is 4-

chambered

Heart is 4-

chambered

Poikilotherms

Poikilotherms

Homoiotherms

Homoiotherms

Alimentary

canal, urinary

& reproductive

tracts open

into a cloaca

which opens to

exterior.

Well-developed

alimentary canal.

Digestive tract

has additional

chambers, the crop

& gizzard.

Well-developed

alimentary canal.

Heterodont,

thecodont &

diphyodont.

Respiration

is by gills (in

larva), lungs

& skin

Respiration by lungs.

Double respiration.

Air sacs connected

to lungs.

Respiration by

lungs.