Classification of Class Mammalia:

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Image showing classification of class Mammalia.
Image showing classification of class Mammalia.

Sub class Prototheria

Sub class Metatheria

Sub class Eutheria

No external ear

External ear present

External ear well developed

Teeth found only in young

teeth found in both young and adults

Teeth present in young as well as adults

Placenta absent

No placenta for nourishment to embryo

Placenta is present

Mammary glands are devoid of nipples

Mammary glands present

Mammary glands present

Females are oviparous. Example: Duck-bill platypus (Ornithorhynchus).

Immature young ones are born. Marsupium (pouch) is present in females. Example: Kangaroo (Macropus)

Mature young ones are born. It is further classified as under.

Image shoiwng red Kangaroo.

Image Showing Red Kangaroo.

Image shoiwng red Kangaroo.

Image showing duck-billed platypus.

Image Showing Duck-Billed Platypus.

Image showing duck-billed platypus.

Birds and mammals have a constant body temperature. They are termed homoiothermal.

Sub class Eutheria :

Order: Rodentia: Small group of animals (Herbivorous and terrestrial), incisors long, sharp and chisel-shaped. Forelimbs shorter than the hind limbs, Example: Rat, squirrel.

Image showing Squirrel.

Image Showing Squirrel.

Image showing Squirrel.

Order: Chiroptera: These are flying mammals. Fore-limbs adapted for flight. Skin folds i.e. patagium works as wing. Example: Bat.

Image showing Bat.

Image Showing Bat.

Image showing Bat.

Order: Carnivora: Flesh-eating mammals. Large pointed and sharp canines to tear the flesh, Fingers with sharp claws, Example: Lion, Tiger, Cat, Dog.

Image showing Carnivora example.

Image Showing Carnivora Example.

Image showing Carnivora example.

Order: Primates: Highly developed Brain. The neck is mobile. Eyes are set forward in the dead to provide binocular vision. Limbs have five digits with flat nails. Two thoracic mammae (breasts) present. Example: Monkey, Apes, Man.

Image showing squirrel monkey.

Image Showing Squirrel Monkey.

Image showing squirrel monkey.

Order: Cetacea: Aquatic, fore-limbs are changed into paddles without neck and Fish-like shape but respiration by lungs. Example: whale.

Image showing killer whale.

Image Showing Killer Whale.

Image showing killer whale.

Order: Proboscidea: Large, herbivorous, terrestrial. Fusion of upper lip and nose to form a long mobile trunk and only one pair of incisors in upper jaw which form huge tusks in males, Example: Elephant.

Image showing asian and african elephant.

Image Showing Asian and African Elephant.

Image showing asian and african elephant.

Order: Ungulata: Hoofed mammals, Herbivorous, Usually domesticated by man and Mammae are abdominal with teats. Example: Deer, Cows, Sheep.

Image showing mule Deer.

Image Showing Mule Deer.

Image showing mule Deer.