What is the characteristic features of class mammalia
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Mammals are the most successful organisms in intelligence and Brain development.
Mammals are the Triploblastic organisms with Heterodont type of teeth and are with nearly 86 vestigial organs.
Mammals are endothermic vertebrates
Have hair and fur on the body
Have mammary glands
Four chambered hearts
Have sebaceous (fat secreting glands), sudoriferus (sweat), and scent glands.
Have heterodont dentation (different types of teeth)
Posses diaphragm
Posses one single jaw bone
Have three small bones in the middle of the ear.
In this way , mammals are having several characteristic features.
Mammals are the most successful organisms in intelligence and Brain development.
Mammals are the Triploblastic organisms with Heterodont type of teeth and are with nearly 86 vestigial organs.
Mammals are endothermic vertebrates
Have hair and fur on the body
Have mammary glands
Four chambered hearts
Have sebaceous (fat secreting glands), sudoriferus (sweat), and scent glands.
Have heterodont dentation (different types of teeth)
Posses diaphragm
Posses one single jaw bone
Have three small bones in the middle of the ear.
In this way , mammals are having several characteristic features.
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Answered by
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1. These animals are warm blooded, hairy and have mammary or milk producing glands, (mammary glands). They are the only animals which nourish their young ones with milk. There are about 4,000 species of mammals found in the world.
2. They are homoiothermous (warm blooded).
3. Oil glands (sebaceous glands) and sweat glands (sudoriferous glands) are present in the skin.
4. Teeth are of different types (heterodont) and are embedded in the sockets of jaws (the codont). These are developed twice during the life-time of the animal (diphyodont), milk and permanent teeth.
5. Except a few, mammals possess seven cervical (neck) vertebrae.
6. The skull is dicondylic i.e., with two occipital condyles.
7. Respiration is by lungs.
8. They possess a muscular diaphragm dividing trunk into thorax and abdomen.
9. The coelom is divided into four cavities; a pericardial cavity lodging the heart, two pleural cavities each containing the lung and an adominal cavity having the rest of viscera.
10. The heart is four chambered. Sinus venosus is absent. The red blood corpuscles are without nucleus. Renal portal system is absent.
11. The brain has large cerebrum and cerebellum. Optic lobes are divided into four lobes called corpora quadrigemina. Corpus callosum connects the two cerebral hemispheres internally.
12. 12 pairs of cranial nerves are present.
13. Each ear consists of three parts: external, middle and internal. Pinna is a part of external ear. Middle ear has 3 bony ear ossicles (malleus— hammer shaped, incus-anvil shaped and stapes-stirrup shaped). Internal ear has organ of Corti, the actual hearing organ.
14. Except egg laying mammals they are viviparous. There are present four embryonic membranes: chorion, amnion, allantois and yolk sac. Except egg laying mammals a well developed placenta is present.
15. Mammals occur in all sorts of habitats. They are dominant animals and are capable to learn because of their better developed brain.
Examples:
Oviparous – Omithorhynchus (Duck Billed Platypus), Tachyglossus = Echidna (Spiny Anteater).
Viviparous — Macropus (Kangaroo), Pteropus (Large bat), Camelus (Camel), Macaca (Monkey), Rattus (Rat), Canis (Dog), Elephas (Elephant), Felis (Cat) Delphinus (Common dolphin), Equus (Horse), Balaenoptera (Blue whale), Panthera tigns (Tiger), Panthera leo (Lion).
2. They are homoiothermous (warm blooded).
3. Oil glands (sebaceous glands) and sweat glands (sudoriferous glands) are present in the skin.
4. Teeth are of different types (heterodont) and are embedded in the sockets of jaws (the codont). These are developed twice during the life-time of the animal (diphyodont), milk and permanent teeth.
5. Except a few, mammals possess seven cervical (neck) vertebrae.
6. The skull is dicondylic i.e., with two occipital condyles.
7. Respiration is by lungs.
8. They possess a muscular diaphragm dividing trunk into thorax and abdomen.
9. The coelom is divided into four cavities; a pericardial cavity lodging the heart, two pleural cavities each containing the lung and an adominal cavity having the rest of viscera.
10. The heart is four chambered. Sinus venosus is absent. The red blood corpuscles are without nucleus. Renal portal system is absent.
11. The brain has large cerebrum and cerebellum. Optic lobes are divided into four lobes called corpora quadrigemina. Corpus callosum connects the two cerebral hemispheres internally.
12. 12 pairs of cranial nerves are present.
13. Each ear consists of three parts: external, middle and internal. Pinna is a part of external ear. Middle ear has 3 bony ear ossicles (malleus— hammer shaped, incus-anvil shaped and stapes-stirrup shaped). Internal ear has organ of Corti, the actual hearing organ.
14. Except egg laying mammals they are viviparous. There are present four embryonic membranes: chorion, amnion, allantois and yolk sac. Except egg laying mammals a well developed placenta is present.
15. Mammals occur in all sorts of habitats. They are dominant animals and are capable to learn because of their better developed brain.
Examples:
Oviparous – Omithorhynchus (Duck Billed Platypus), Tachyglossus = Echidna (Spiny Anteater).
Viviparous — Macropus (Kangaroo), Pteropus (Large bat), Camelus (Camel), Macaca (Monkey), Rattus (Rat), Canis (Dog), Elephas (Elephant), Felis (Cat) Delphinus (Common dolphin), Equus (Horse), Balaenoptera (Blue whale), Panthera tigns (Tiger), Panthera leo (Lion).
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