Temporal range: Late Jurassic to Holocene, 161–0 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Eomaia fossil
Kangaroo with her joey
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Mammalia
Clade:
Zatheria
Clade:
Tribosphenida McKenna, 1975
Clades
†Australosphenida?
Boreosphenida?
†Aegialodontia
†Eomaia
†Hypomylos
Theria
Synonyms
Boreosphenida Luo et al., 2001
Tribosphenida is a group (infralegion) of mammals that includes the ancestor of Hypomylos, Aegialodontia and Theria (the last common ancestor of marsupials and placentals plus all of its descendants). It belongs to the group Zatheria.[1] The current definition of Tribosphenida is more or less synonymous with Boreosphenida.[2][3]
^Panciroli E; Roger B.J. Benson; Richard J. Butler (2018). "New partial dentaries of amphitheriid mammalian Palaeoxonodon ooliticus from Scotland, and posterior dentary morphology in early cladotherians". Acta Palaeontologica Polonica. 63 (2). doi:10.4202/app.00434.2017.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Kielan-Jaworowska, Zofia; Cifelli, Richard L; Luo, Zhe-Xi (2004). Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure. New York: Columbia University Press. ISBN 978-0-231-11918-4.
Tribosphenida is a group (infralegion) of mammals that includes the ancestor of Hypomylos, Aegialodontia and Theria (the last common ancestor of marsupials...
suggested to have acquired tribosphenic molars independently from those of Tribosphenida, this has been disputed. Fossils of australosphenidans have been found...
Grace; Helgen, Kristofer M. (2022-10-02). "The Gondwanan Origin of Tribosphenida (Mammalia)". Alcheringa: An Australasian Journal of Palaeontology. 46...
Cladotheria incorporates a set of nested mammal clades culminating in Tribosphenida (also known as Boreosphenida), mammals with fully tribosphenic teeth...
class Mammalia, legion Cladotheria, sublegion Zatheria, infralegion Tribosphenida, subclass Theria, clade Eutheria, clade Placentalia – but only Mammalia...
subclasses Australosphenida—the monotremes and extinct relatives—and Tribosphenida—placentals and marsupials. However, given this classification is based...
†Vincelestidae Infralegion †Peramura Family †Peramuridae Infralegion Tribosphenida Family †Necrolestidae Supercohort †Aegialodontia Family †Aegialodontidae...
description in 1999, Ambondro was interpreted as a primitive relative of Tribosphenida (marsupials, placentals, and their extinct tribosphenic-toothed relatives)...
†Meridiolestida Prototribosphenida †Amphitheriidae (here) Zatheria †Peramuridae Tribosphenida various extinct genera Theria Eutheria (placentals and relatives) Metatheria...
Berriasian, Cretaceous, UK) and its bearing on the 'dual origin' of Tribosphenida". Comptes Rendus de l'Académie des Sciences, Série IIA. 333 (2): 141–147...
Prototribosphenida. Prototribosphenida is the mammalian subgroup containing Tribosphenida (true Laurasian tribosphenic mammals) and certain close relatives such...
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