Mammals

Infraclass	Superorder	Order	Common Representatives
Orders of Mammals
Eutheria	Afrotheria	Afrosoricida	golden moles
Eutheria	Afrotheria	Hyracoidea	hyraxes
Eutheria	Afrotheria	Macroscelidea	elephant shrews
Eutheria	Afrotheria	Sirenia	manatees
Eutheria	Afrotheria	Proboscidea	elephants
Eutheria	Afrotheria	Tubulidentata	aardvarks

Eutheria	Euarchontoglires	Dermoptera	flying lemurs
Eutheria	Euarchontoglires	Lagomorpha	rabbits
Eutheria	Euarchontoglires	Primates	chimps
Eutheria	Euarchontoglires	Rodentia	mice
Eutheria	Euarchontoglires	Scandentia	tree shrews

Eutheria	Laurasiatheria	Artiodactyla	pigs, goats, sheep, cows
Eutheria	Laurasiatheria	Carnivora	cats and dogs
Eutheria	Laurasiatheria	Cetacea	whales and dolphins
Eutheria	Laurasiatheria	Chiroptera	bats
Eutheria	Laurasiatheria	Erinaceomorpha	hedgehogs
Eutheria	Laurasiatheria	Perissodactyla	horses
Eutheria	Laurasiatheria	Pholidota	scaly anteaters
Eutheria	Laurasiatheria	Soricomorpha	white-toothed shrews

Eutheria	Xenarthra	Cingulata	armadillos
Eutheria	Xenarthra	Pilosa	giant anteaters


Marsupial	Ameridelphia	Didelphimorphia	Virginia opossums
Marsupial	Ameridelphia	Paucituberculata	shrew opossums

Marsupial	Australidelphia	Dasyuromorphia	Tasmanian devils
Marsupial	Australidelphia	Diprotodontia	kangaroos
Marsupial	Australidelphia	Microbiotheria	monito del monte
Marsupial	Australidelphia	Notoryctemorphia	marsupial moles
Marsupial	Australidelphia	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

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[1] ttp://species.wikimedia.org/wiki/Mammalia

[2] ttp://en.wikipedia.org/wiki/Eutheria

[3] ttp://mbe.oxfordjournals.org/content/24/9/2059.short

[4] ttp://www.ncbi.nlm.nih.gov/pubmed/12878458

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