Mammalia (taxonomy)

Mammalia is a class of animal in the phylum Chordata. What it means to be a mammal has changed many times since Carl Linnaeus first defined the class. No system is accepted by everyone. McKenna & Bell (1997) and Wilson & Reader (2005) give useful recent compendiums. Many earlier ideas from Linnaeus and others are no longer used by modern taxonomists. Among these are the idea that bats are related to birds or that humans are a group outside of other living things. The field has had a recent surge in interest and modification due to the results of molecular phylogenetics.

Class: Mammalia: 
Subclass: Prototheria (Monotremes or egg laying mammals)
Clade: Australosphenida
Order: Platypoda platypuses
Order: Tachyglossa echidnas
Subclass: Theriiformes
Infraclass: †Allotheria (extinct)
Order: †Multituberculata (extinct)
Suborder: †Gondwanatheria (extinct)
Infraclass: Holotheria
Supercohort: Theria (placentals or live bearing mammals)
Cohort: Marsupialia
Superorder: Ameridelphia
Order: Didelphimorphia
Order: Paucituberculata
Superorder: Australodelphia
Order: Microbiotheria
Order: Dasyuromorphia
Order: Peramelemorphia
Order: Notoryctemorphia
Order: Diprotodontia
Cohort: Eutheria
Superorder: Xenarthra
Order: Pilosa
Order: Cingulata
Superorder: Leptictida (extinct)
Superorder: Anagalida
Mirordo: Macroscelidea
Order: Rodentia
Order: Lagomorpha
Superorder: Archonta
Suborder: Dermoptera
Order: Primates
Order: Scandentia
Order: Chiroptera
Superorder: Lipotyphla
Order: Chrysochloridea
Order: Erinaceomorpha
Order: Soricomorpha
Superorder: Ferae
Order: Carnivora
Order: Cimolesta
Superorder: Ungulata
Order: Tubulidentata
Order: Uranotheria
Suborder: Hyracoidea
suborder: Proboscidea
Suborder: †Desmostylia (extinct)
Infraordo: Sirenia
Suborder: †Embrythopoda (extinct)
Order: Artiodactyla
Suborder: Cetacea
Order: Perissodactyla
Superorder †Meridiungulata
Order: †Notoungulata (extinct)
Order: †Astrapotheria (extinct)
Order: †Xenungulata (extinct)
Order: †Litopterna (extinct)
Order: †Condylarthra (extinct)

References

 mammalia