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WikiProject Mammals (Rated Stub-class, High-importance)
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Hi! Dont all the animals within Monotremata actually lay eggs? If so, then why are they classified as Theria if all Theria "...give birth to live young without using a shelled egg?" Email me at with the answer...I am studying this for a paleontology class. —Preceding unsigned comment added by (talk) 19:47, 14 April 2009 (UTC)

Are these not the Eutheria? User:Wetman

Eutheria are the placental mammals. Theria includes the marsupials but not the monotremes.

that seems like over-categorization to me. --Philo Gamepad.svg 17:35, 15 December 2006 (UTC)

Thank you, I got it now. Erase this at your pleasure ````

Added the stub flag and some context.

Please see my point below if you are still confused. Shanoman (talk) 17:32, 28 August 2008 (UTC)

Note the word is also used as abbervation for Therianthrope. --DustWolf 12:04, 10 October 2005 (UTC)

Accuracy tag[edit]

An accuracy tag was placed on the page. What is the disputed content? --Aranae 08:20, 30 April 2007 (UTC)

Apparently the dispute was as to the use of the classification "Theria". This is now cited, but it's a book so I can't verify. We probably need additional refs or a verification to remove the tag. 13:23, 9 May 2007 (UTC)

It is referenced here, is that enough to remove the tag? --DeadWisdom 23:11, 5 June 2007 (UTC)

I have added that reference to the article and removed the tag. If people still have issues with the page, they'll have to come here to the talk page and be more specific about what the problem is. Kingdon 21:30, 29 June 2007 (UTC)

Classification and logic[edit]

Theria are indeed the eutheria; theria are also the metatheria; thus theria include both [all of] the eutheria in addition to [all of] the metatheria.

OR, if you prefer: All eutherians (placentals) are therians; All metatherians (marsupials) are also therians; Therefore, Therians = all eutherians + all metatherians

The designation or grouping "Theria" describes what placentals and marsupials have in common with each other (namely, giving live birth to their young), and what distinguishes them both from the more primitive, egg-laying protherians. This may seem like "overclassification" to some of my fellow laypeople, but it seems to me like it is quite standard procedure among those professionals and other experts dealing with taxonomy (classification). Shanoman (talk) 17:32, 28 August 2008 (UTC)

Taxonomic rank - what's going on?[edit]

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia

So far so good. But then:

Subclass: Theriiformes
Superorder: Theria

and then it lists "infraclasses". Surely infraclass is a higher taxonomic rank than superorder?

Eutheria gives Theria as being a subclass, which makes more sense, but then what is Theriiformes? -- Smjg (talk) 20:50, 27 October 2009 (UTC)

Someone just had to put it as superorder since the infobox doesn't support supercohort (and {{Taxobox entry}} works poorly with authority) Narayanese (talk) 21:23, 27 October 2009 (UTC)
I had a go at fixing this conflict and explaining a bit in the text. The confusion seems to be from two different mammal classification systems, one that has a subclass named Theria, and another that has a subclass named Theriiformes and in which Theria appears lower down in the hierarchy. The whole idea of these rankings is kind of problematic in phylogenetics anyway, since new taxa keep being interpolated between the old ranked ones. --Gblandst (talk) 20:29, 3 December 2009 (UTC)


In the taxobox, the links from infraclasses and below don't work. Dab14763 (talk) 21:16, 1 November 2009 (UTC)