Mammals
Orders of Mammals
Infraclass Superorder Order Common Representatives
EutheriaAfrotheria Afrosoricida golden moles
EutheriaAfrotheria Hyracoidea hyraxes
EutheriaAfrotheria Macroscelidea elephant shrews
EutheriaAfrotheria Sirenia manatees
EutheriaAfrotheria Proboscidea elephants
EutheriaAfrotheria Tubulidentata aardvarks
EutheriaEuarchontoglires Dermoptera flying lemurs
EutheriaEuarchontoglires Lagomorpha rabbits
EutheriaEuarchontoglires Primates chimps
EutheriaEuarchontoglires Rodentia mice
EutheriaEuarchontoglires Scandentia tree shrews
EutheriaLaurasiatheria Artiodactyla pigs, goats, sheep, cows
EutheriaLaurasiatheria Carnivora cats and dogs
EutheriaLaurasiatheria Cetacea whales and dolphins
EutheriaLaurasiatheria Chiroptera bats
EutheriaLaurasiatheria Erinaceomorpha hedgehogs
EutheriaLaurasiatheria Perissodactyla horses
EutheriaLaurasiatheria Pholidota scaly anteaters
EutheriaLaurasiatheria Soricomorpha white-toothed shrews
EutheriaXenarthra Cingulata armadillos
EutheriaXenarthra Pilosa giant anteaters
MarsupialAmeridelphia Didelphimorphia Virginia opossums
MarsupialAmeridelphia Paucituberculata shrew opossums
MarsupialAustralidelphia Dasyuromorphia Tasmanian devils
MarsupialAustralidelphia Diprotodontia kangaroos
MarsupialAustralidelphia Microbiotheria monito del monte
MarsupialAustralidelphia Notoryctemorphia marsupial moles
MarsupialAustralidelphia Peramelemorphia marsupial omnivores


Mammals are a class of tetrapods that include camels, chimpanzees, cats and rats and elephants, goats and sheep, horses and cows. [1] The class of mammals can be divided into two main infraclasses: eutheria and the marsupials.



EUTHERIA = the crown placental mammals


Eutheria (Greek: "true beasts") is a group of mammals consisting of the first placental mammal and all of her decendants. The earliest known fossil eutherian, Eomaia, was found in Asia, and is dated to the Early Cretaceous period, about 125 million years ago. [2] Most placental mammals belong to one of four main superorders: Afrotheria, Euarchontoglires, Laurasiatheria, and Xenarthra.

Eutheria

Boreoeutheria


Euarchontoglires

Laurasiatheria



Atlantogenata


Xenarthra

Afrotheria





Euarchontoglires + Laurasiatheria = Boreoeutheria

and

Xenarthra + Afrotheria = Atlantogenata.


Xenarthra diverged from Afrotheria relatively rapidly after Atlantogenata diverged from Boreoeutheria. There was considerable gene flow among the nascent clades prior to their divergence. This made it difficult to resolve the above phylogenic tree until relatively recently. [3]


MARSUPIALS

The seven living orders of marsupials are divided into two clades: Ameridelphia and Australidelphia. [4]


MONOTREMATA

mammals

Theria


Eutheria

Marsupials

Monotremata





Order monotremata = Subclass prototheria


Eutheria + Marsupials = Subclass theria




References

  1. ↑ http://species.wikimedia.org/wiki/Mammalia
  2. ↑ http://en.wikipedia.org/wiki/Eutheria
  3. ↑ http://mbe.oxfordjournals.org/content/24/9/2059.short
  4. ↑ http://www.ncbi.nlm.nih.gov/pubmed/12878458
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