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Topic: Metatheria

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	NationMaster - Encyclopedia: Metatheria
		Infraclasses Eutheria Metatheria Theria is a subclass of advanced mammals that give birth to live young without using a shelled egg.
		The names "Prototheria", "Metatheria" and "Eutheria" expressed the theory that Placentalia were descendants of Marsupialia, which were in turn descendants of Monotremata, but this theory has been refuted.
		However, Eutheria and Metatheria are often used in paleontology, especially with regards to mammals of the Mesozoic.
	www.nationmaster.com /encyclopedia/Metatheria (646 words)

	NationMaster - Encyclopedia: Prototheria
		Binomial name Ornithorhynchus anatinus (Shaw, 1799) The Platypus (Ornithorhynchus anatinus) is a small, half-aquatic mammal endemic to the eastern part of Australia, and one of the three extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young (the other two are echidnas).
		These three subclasses, Prototheria, Metatheria, and Eutheria, mean 'first beast', 'intermediary beast', and 'true beast', first proposed by Thomas Huxley.
		They retain many characters of their therapsid ancestors (for example, a complex pectoral girdle, laying of eggs rather than bearing live young, limbs oriented with humerus and femur held lateral to body, and a cloaca).
	www.nationmaster.com /encyclopedia/Prototheria (740 words)

	Prototheria - Wikipedia, the free encyclopedia
		However, it is always possible that fossils will come to light placing creatures of some other order in that group, and Prototheria is often used in contrast to the two other subclasses, Marsupialia and Placentalia (or, in more modern scientific terms, Metatheria and Eutheria).
		These three subclasses; Prototheria, Metatheria, and Eutheria; mean "first beast", "intermediary beast", and "true beast".
		Metatheria and Eutheria are often grouped as magnorders of the subclass Theria.
	en.wikipedia.org /wiki/Prototheria (175 words)

	Metatheria (Site not responding. Last check: 2007-11-01)
		Metatheria is a grouping within the animal class Mammalia.
		McKenna MC & Bell SK, (1997), Classification of Mammals Above the Species Level.
		Metatheria Information about the Metatherian mammals, also known as marsupials.
	www.serebella.com /encyclopedia/article-Metatheria.html (181 words)

	Zoogdieren - Wikipedia
		Hoewel de primitievere leden van de klasse (de cloacadieren, bijvoorbeeld het vogelbekdier en de mierenegel) eierleggend zijn, brengen de meeste zoogdieren hun jongen levend ter wereld.
		Bij de buideldieren (Metatheria) zijn de jongen nog erg weinig ontwikkeld en verblijven ze (bij sommige soorten) na hun geboorte nog lange tijd in een buidel, waar zij zich verder ontwikkelen.
		Bij de placentadieren (Placentalia) wordt een verder ontwikkeld jong geboren na een verblijf in de baarmoeder, waar het via de navelstreng van voedsel en zuurstof wordt voorzien.
	nl.wikipedia.org /wiki/Zoogdier (1173 words)

	SchoolWork // Metatherian Mode of Reproduction
		In comparison, there seems to be significant structural complications arising from the seemingly random placement of the ureters between the metatheria and eutheria.
		The fact that the metatheria have altricial young may simply be a consequence of the short gestation period.
		I hypothesise that it was simply by chance the ureters in metatheria are centrally located, and this placement may or may not have had direct ramifications on the length of gestation and the degree of development of the young before they are expelled from the internal body of the mother.
	wolfs-rain.digital-tenshi.com /MarsD.html (2435 words)

	Prototheria (Site not responding. Last check: 2007-11-01)
		However, Prototheria is oftenused in contrast to the two other subclasses, Marsupialia and Placentalia (or, in more modern scientific terms, Metatheria and Eutheria).
		These three subclasses,Prototheria, Metatheria, and Eutheria, mean 'first beast', 'intermediary beast', and 'true beast',first proposed by Thomas Huxley.
		Metatheria and Eutheria are oftengrouped as magnorders of the subclass Theria.
	www.therfcc.org /prototheria-161470.html (92 words)

	ADW: Metatheria: Information
		Metatheria has undergone two major adaptive radiations (in Australia and South America) and exhibit a vast array of behavior as a consequence of evolving to fill a variety of ecological niches on these two continents.
		Marsupials may be arboreal, terriculous, or fossorial and at least one species is semi-aquatic (water opossums).
		As with mammals in general, vision, olfaction, hearing and touch are all important to varying degrees among species of Metatheria.
	animaldiversity.ummz.umich.edu /site/accounts/information/Metatheria.html (2646 words)

	Untitled Document (Site not responding. Last check: 2007-11-01)
		The hypothesis of independent origin of the Metatheria and Eutheria from taxa with molars of an aegialodontan stage of development is not supported from functional-adaptive considerations.
		The derived therian nature of the primitive metatherian dental formula is supported, and it is argued that deltatheroidans are modified for a hypercarnivorous diet, as attested by their molar dentition and skull form.
		Deltatheroidans and asiatheriids are separate and primarily Asiatic clades of Metatheria that suggest a complex and hitherto poorly understood paleobiogeography for therians in the Cretaceous.
	www.vertpaleo.org /jvp/16-474-509.html (310 words)

	On the Laws of Evolution (1880)
		And if there were any known animals which combined these characters, with a complete double dentition, unmodified pentadactyle manus and pes, and normal uterogestation, they would furnish us with the exact transition between the Prototheria and the higher mammals, which must have existed if the law of evolution is trustworthy.
		It is obvious that, in all these respects, we have the mammalian type in a higher stage of evolution than that presented by the Prototheria and the Metatheria.
		It is a fact, curiously in accordance with what might be expected on evolutionary principles, that while the existing members of the Prototheria-and the Metatheria are all extremely modified, there are certain forms of living Eutheria which depart but little from the general type.
	aleph0.clarku.edu /huxley/SM4/Vert.html (4010 words)

	METATHERIA
		The oldest known representative is 125 million years old and from China.
		Still, in terms of what's presently available, the therian split seems to have occurred between 145 and 125 million years ago; certainly no later.
		As Sinodelphys is basal as well as early, this may indicate a Eurasian cradle for Metatheria.
	home.arcor.de /ktdykes/meta.htm (684 words)

	Hierarchies
		Again we hypothesize that the common ancestor for Metatheria had a marsupium.
		Likewise, Eutheria and Metatheria are children of Mammalia.
		Siblings Eutheria and Metatheria are each subgroups of more inclusive groupings such as Mammalia, the common ancester of which is believed to have had fur and mammory glands.
	biology.fullerton.edu /biol261/hierarchies.html (1127 words)

	sistematica filogenetica (Site not responding. Last check: 2007-11-01)
		Na sua proposição, contudo, um primata atual, incluído nos Eutheria, seriam derivados de primatas Metatheria (e não dos marsupiais atuais), os quais seriam derivados de primatas Prototheria (e não dos Prototheria atuais) e estes, por sua vez, de primatas Hypotheria (para Huxley, os Hypoteria representam um estágio ancestral hipotético da evolução dos Mammalia).
		Apesar dessa visão heterodoxa, os termos Prototheria, Metatheria e Eutheria mantiveram-se na literatura subseqüente para designar os monotremados, marsupiais e placentários, respectivamente.
		O táxon Eutheria de Gill foi posteriormente rebatizado de Theria, sendo Eutheria mantido apenas para os placentários.
	www.ufba.br /~zoo4/sistemat.htm (1620 words)

	Metatheria
		After McKenna and Bell, 1997, de Muizon, Cifelli and Céspedes, 1997, and Szalay and Trofimov, 1996, with species from Alroy, 2002
		Phylogeny of Metatheria after Szaley and Trofimov, 1996
		<==o Metatheria Huxley, 1880 [Marsupialia sensu lato] (marsupials and relatives; pussieläimet) ?- †Sinodelphys szalayi Luo, Ji, Wible and Yuan, 2003 -- †Holoclemensia texana (Slaughter, 1968) [†Clemensia Slaughter, 1968 (non Clemensia Packard, 1864, a butterfly)] L.Cret.
	www.fmnh.helsinki.fi /users/haaramo/Metazoa/Deuterostoma/Chordata/Synapsida/Metatheria/Metatheria.htm (395 words)

	Comparative Anatomy Topic 3 - Mammals (Site not responding. Last check: 2007-11-01)
		Theria means beasts and refers to the mammals that give birth to live young.
		The therians are broken into two groups, the Metatheria and the Eutheria based on the relative length of gestation, short in metatherians and long in eutherians.
		Marsupials or the Metatheria (middle beasts) typically lack a placenta (although a few have independently evolved one) and typically hold their young in pouches or folds after they have marginally developed in the womb.
	www.auburn.edu /academic/classes/zy/0301/Topic3e/Topic3e.html (841 words)

	Sample test questions (Site not responding. Last check: 2007-11-01)
		Pedicellaria are found in : a) echinoderms b) amphibians c) agnatha d) birds 14).
		The genus Trichechus is in the order __1__ and subclass __2__ a) Cetacea ; metatheria b) Sirenia ; eutheria c) Cetacea ; eutheria d) Sirenia ; metatheria 15).
		a) metatheria b) eutheria c) prototheria d) atheria 16).
	web.fccj.org /~dbyres/2011sampletest6.htm (463 words)

	Marsupialia (Site not responding. Last check: 2007-11-01)
		Metatheria, Kangaroos, koalas, gliders, wombats, opossums, bandicoots, bilbies, etc.
		New Cretaceous marsupial from Mongolia and the early radiation of Metatheria.
		Tree of Life design and icons copyright © 1995-2004 Tree of Life Project.
	www.tolweb.org /tree?group=Marsupialia (620 words)

	Re: Metatheria (was Re: Declining pterosaur diversity)
		Subject: Re: Metatheria (was Re: Declining pterosaur diversity)
		Unfortunately, everybody else appears to prefer A. rhaister.
		Previous by thread: Metatheria (was Re: Declining pterosaur diversity)
	dml.cmnh.org /2004Dec/msg00034.html (221 words)

	NCBI Databases and Entrez Searching
		You can build a phylogenetic data set that could be used to analyze the taxonomic position of the Tasmanian Tiger with the Taxonomy Browser.
		Click on the Metatheria (Marsupial) link in the lineage of the tiger.
		Retrieve the entry for Metatheria and get the nucleotide sequences.
	www.people.virginia.edu /~wrp/cshl01/ncbi_databases_workshop.html (2448 words)

	Marsupialia (Beuteltiere)
		Mammalia : Theria : Metatheria : Marsupialia : Übersicht
		Marsupialia (Beuteltiere) [Macropus], einzige rezente Ordnung der Metatheria.
		Besuchen Sie 2eNetWorX und Open Source & Free Software für weitere freie Software-Projekte unter Win32.
	www.kefk.net /Fauna/Mammalia/Theria/Metatheria/Marsupialia/index.asp (40 words)

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