Skeleton of Microtherulum, a basal eutherian from the Early Cretaceous of China
Northern treeshrew (Tupaia belangeri), a placental eutherian from Southeast Asia
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Subclass:
Theria
Clade:
Eutheria Gill, 1872
Subgroups
see text.
Eutheria (from Greek εὐ-, eú- 'good, right' and θηρίον, thēríon 'beast'; lit.'true beasts'), also called Pan-Placentalia, is the clade consisting of placental mammals and all therian mammals that are more closely related to placentals than to marsupials.
Eutherians are distinguished from noneutherians by various phenotypic traits of the feet, ankles, jaws and teeth. All extant eutherians lack epipubic bones, which are present in all other living mammals (marsupials and monotremes). This allows for expansion of the abdomen during pregnancy.[1] However epipubic bones are present in some primitive eutherians.[2] Eutheria was named in 1872 by Theodore Gill; in 1880, Thomas Henry Huxley defined it to encompass a more broadly defined group than Placentalia.[3]
The oldest-known eutherian species is Juramaia sinensis, dated at 161 million years ago from the early Late Jurassic (Oxfordian) of China.[4] However, this early dating has been questioned, and Juramaia may originate from Early Cretaceous instead, which would make it contemporaneous to several other known eutherians.[5]
^Reilly, Stephen M.; White, Thomas D. (2003-01-17). "Hypaxial Motor Patterns and the Function of Epipubic Bones in Primitive Mammals". Science. 299 (5605): 400–402. Bibcode:2003Sci...299..400R. doi:10.1126/science.1074905. ISSN 0036-8075. PMID 12532019.
^Guilhon, Gabby; Braga, Caryne; Milne, Nick; Cerqueira, Rui (November 2021). "Musculoskeletal anatomy and nomenclature of the mammalian epipubic bones". Journal of Anatomy. 239 (5): 1096–1103. doi:10.1111/joa.13489. ISSN 0021-8782. PMC 8546510. PMID 34195985.
^Archibald, J David. Eutheria (Placental Mammals)(PDF). San Diego, California: San Diego State University.
^Luo, Z.; C. Yuan; Q. Meng; Q. Ji (2011). "A Jurassic eutherian mammal and divergence of marsupials and placentals". Nature. 476 (7361): 42–45. Bibcode:2011Natur.476..442L. doi:10.1038/nature10291. PMID 21866158.
^King, Benedict; Beck, Robin M. D. (2020-06-10). "Tip dating supports novel resolutions of controversial relationships among early mammals". Proceedings of the Royal Society B: Biological Sciences. 287 (1928): 20200943. doi:10.1098/rspb.2020.0943. ISSN 0962-8452. PMC 7341916. PMID 32517606.
Eutheria (from Greek εὐ-, eú- 'good, right' and θηρίον, thēríon 'beast'; lit. 'true beasts'), also called Pan-Placentalia, is the clade consisting of placental...
and several species of echidna. The names Prototheria, Metatheria, and Eutheria (loosely meaning "first beasts", "changed beasts", and "true beasts", respectively)...
the mother's pouch. Placentalia represents the only living group within Eutheria, which contains all mammals more closely related to placentals than to...
clade Eutheria, clade Placentalia – but only Mammalia and Theria are in the table. Legitimate arguments might arise if the commonly used clades Eutheria and...
relatives. It is one of two groups placed in the clade Theria alongside Eutheria, which contains the placentals. Distinctive characteristics (synapomorphies)...
About 490 species of mammals are recorded in the United States. Unincorporated territories such as Puerto Rico, Guam or Northern Mariana Islands are not...
This is a list of the mammal species recorded in Corsica, France. The following tags are used to highlight each species' conservation status as assessed...
revision, and dental ontogeny of the Cretaceous Zhelestidae (Mammalia: Eutheria), Article · Feb 2012 · Zoological Journal of the Linnean Society Rougier...
Retrieved 15 May 2015. Jarman, P. J; Lee, A. K.; Hall, L. S. "Fauna of Australia:Natural History of the Eutheria" (PDF). Retrieved 15 May 2015. v t e...
This is a list of the mammal species recorded in Peru. There are 417 mammal species in Peru, of which five are critically endangered, nine are endangered...
of fur and imprints of soft tissues. The oldest-known fossil among the Eutheria ("true beasts") is the small shrewlike Juramaia sinensis, or "Jurassic...
names Metatheria and Eutheria to incorporate the two latter groups in 1880. Initially treated as subclasses, Metatheria and Eutheria are by convention now...
Afrotheria is now recognized as one of the three major groups within the Eutheria (containing placental mammals). Relations within the three cohorts, Afrotheria...
This is a list of the mammal species recorded in Papua New Guinea. There are 244 mammal species in Papua New Guinea, of which seven are critically endangered...
gobiensis from the Late Cretaceous of Mongolia and the phylogeny of Cretaceous Eutheria". Bulletin of the American Museum of Natural History. 2009 (327): 1–123...
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