Mammalia is not a phylum, but a Class. The phylum is Chordata.
Platypuses and echidnas are mammals because, like all mammals, they feed their young on mothers' milk. This is despite them being egg-laying mammals. The defining trait of a mammal is to have mammary glands, to produce milk for its young. The platypus and the echidna produce their milk from numerous glands over their underside, and the milk runs into grooves from which the young drink. This is unlike other mammals which have teats.
There are other reasons why echidnas and platypuses are classified as mammals, such as having skin, hair or fur, being warm blooded and breathing via lungs (not gills).
Most mammals are also characterised by the following anatomical features, which the echidna and platypus share:
- A flexible neck with seven cervical vertebrae
- Mammals also show enhanced neocortex development
- Sound is produced by the larynx (a modified region of the trachea)
- limbs are oriented vertically
- The mammalian heart has 4 chambers
- Internal temperature is generally high
- Egg development occurs in the uterus (excluding monotremata)
- They have sweat glands
- A single lower jaw bone
- Diaphragm
- Three bones for a middle ear
- Give birth to young alive
- Feeds milk to its young
- Has hair on its body
The platypus is a mammal, sub class Prototheria.Like the echidna, it is a monotreme, which is an egg-laying mammal. This puts it in the order monotremata.Its scientific name is Ornithorhynchus Anatinus.The seven levels of classification are:Kingdom: AnimaliaPhylum: ChordataClass: MammaliaOrder: MonotremataFamily: OrnithorhynchidaeGenus: OrnithorhynchusSpecies: anatinus
The house cat belongs to the phylum Chordata and the class Mammalia.
An echidna is of the Phylum Chordata, Class Mammalia, Order Monotremata.
A squirrel belongs to the phylum Chordata, specifically in the class Mammalia.
The classification of the platypus is: Kingdom: Animalia Phylum: Chordata Class: Mammalia Subclass: Prototheria Order: Monotremata
A dog belongs to the Chordata phylum and the Animalia Kingdom. The dog also belongs to the Mammalia class and the Canidae family.
A jaguar belongs to the Kingdom Animalia, Phylum Chordata and Class Mammalia.
The Domestic Dog belongs to the Phylum Chordata, Class Mammalia and Order Carnivora.
The goat belongs to the Animalia kingdom and the Chordata phylum. The goat also belongs to the Mammalia class, Artiodactyla order, and the Capra genus.
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia Family: Muridae Genus: Rattus Species: Rattus norvegicus
The platypus is of the phylum Chordata.
The platypus is in the kingdom Animalia.It is a mammal, and a monotreme, or egg-laying mammal.It is classified into phylum chordata, class mammalia, order monotremata, and family Ornithorhynchidae.