Tribosphenida

Tribosphenida Temporal range: Middle Jurassic - Present, 165–0 Ma PreЄ Є O S D C P T J K Pg N
Kangaroo with her joey
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Legion:	Cladotheria
Sublegion:	Zatheria
Infralegion:	Tribosphenida McKenna, 1975
Clades
†Aegialodon †Eomaia †Hypomylos †Necrolestes? †Fruitafossor? Theria

Tribosphenida is a group (infralegion) of mammals that includes the ancestor of Hypomylos, Necrolestidae, Aegialodontia and Theria (the last common ancestor of marsupials and placentals plus all of its descendants).

Phylogeny

Below is a cladogram from Rowe (1988) and McKenna and Bell (1997) showing one hypothesis of mammal relationships:^[1][2]

Mammaliaformes	†Morganucodontidae Mammalia  Prototheria→Monotremata Theriiformes †Allotheria→†Multituberculata Holotheria †Kuehneotheria Trechnotheria †Zhangheotherium †("Symmetrodonta")  Cladotheria  †Dryolestoidea  Zatheria  †Peramura Tribosphenida †Aegialodontia  Theria  Metatheria→Marsupialia Eutheria→Placentalia

References

1. Rowe, Timothy (1988). "Definition, diagnosis, and origin of Mammalia". Journal of Vertebrate Paleontology 8 (3): 241–264. doi:10.1080/02724634.1988.10011708. ISSN 0272-4634.
2. McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals Above the Species Level. Columbia University Press. pp. 9–10. ISBN 978-0-231-11012-9. Retrieved 16 March 2015.

External links

• MESOZOIC MAMMALS; Stem zatherians, zatherians & Peramuridae, an internet directory
• THERIA И MARSUPIONTA (in Russian)
• Infralegion Tribosphenida - Hierarchy - The Taxonomicon

Further reading

• McKenna, Bell: Classification of Mammal: Above the Species Level
• Teun van Rheede, Trijntje Bastiaans, David N Boone, S Blair Hedges, Wilfried W de Jong, Ole Madsen: The Platypus is in its Place: Nuclear Genes and Indels Confirm the Sister Group Relation of Monotremes and Therians.