# Theriimorpha

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{{Short description|Clade of mammals}}
{{Automatic taxobox
| fossil_range = {{fossilrange/linked|Toarcian|Present}}
| image = Gobiconodon ostromi.JPG
| image_caption = Skeleton of ''[Gobiconodon ostromi](/source/Gobiconodon_ostromi)'' ([Eutriconodonta](/source/Eutriconodonta))
| taxon = Theriimorpha
| authority = Rowe, 1993
| subdivision_ranks = Subgroups
| subdivision = *{{extinct}}[Eutriconodonta](/source/Eutriconodonta)
*{{extinct}}''[Fruitafossor](/source/Fruitafossor)''?
*[Theriiformes](/source/Theriiformes)
**{{extinct}}[Allotheria](/source/Allotheria) (sometimes recovered as stem-mammals)
**[Trechnotheria](/source/Trechnotheria)
}}

'''Theriimorpha''' is a clade of mammals defined as including all mammals more closely related to [therians](/source/Theria) (including [placental mammals](/source/Placentalia) and [marsupial](/source/marsupial)s) than to [monotreme](/source/monotreme)s. [Eutriconodonta](/source/Eutriconodonta) is usually considered among the most [basal](/source/Basal_(phylogenetics)) members of this group, with other members more closely related to therians like [Allotherians](/source/Allotheria) placed in the subclade [Theriiformes](/source/Theriiformes),<ref>{{cite book | vauthors = Rowe T |chapter = Phylogenetic Systematics and the Early History of Mammals |date=1993 | title = Mammal Phylogeny |pages=129–145 | location = New York, NY |publisher=Springer New York |language=en |doi=10.1007/978-1-4613-9249-1_10 |isbn=978-1-4613-9251-4 | veditors = Szalay FS, Novacek MJ, McKenna MC }}</ref> though Eutriconodonta has also been recovered as less closely related to therians than monotremes are in some analyses, placing them outside the [crown group](/source/crown_group) of [Mammalia](/source/Mammalia).<ref>{{Cite journal |last1=Luo |first1=Zhe-Xi |last2=Gatesy |first2=Stephen M. |last3=Jenkins |first3=Farish A. |last4=Amaral |first4=William W. |last5=Shubin |first5=Neil H. |date=2015-12-22 |title=Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution |journal=Proceedings of the National Academy of Sciences |language=en |volume=112 |issue=51 |pages=E7101-9 |doi=10.1073/pnas.1519387112 |issn=0027-8424 |pmc=4697399 |pmid=26630008 |bibcode=2015PNAS..112E7101L |doi-access=free }}</ref><ref>{{Cite journal |last1=Hoffmann |first1=Simone |last2=Beck |first2=Robin M. D. |last3=Wible |first3=John R. |last4=Rougier |first4=Guillermo W. |last5=Krause |first5=David W. |date=2020-12-14 |title=Phylogenetic placement of Adalatherium hui (Mammalia, Gondwanatheria) from the Late Cretaceous of Madagascar: implications for allotherian relationships |url=https://www.tandfonline.com/doi/full/10.1080/02724634.2020.1801706 |journal=Journal of Vertebrate Paleontology |language=en |volume=40 |issue=sup1 |pages=213–234 |doi=10.1080/02724634.2020.1801706 |bibcode=2020JVPal..40S.213H |s2cid=230968231 |issn=0272-4634|url-access=subscription }}</ref> The unusual Late Jurassic digging mammal ''[Fruitafossor](/source/Fruitafossor)'' has also been suggested to be a basal theriimorph in some studies.<ref>{{cite journal | vauthors = Hughes EM, Wible JR, Spaulding M, Luo ZX | title = Mammalian petrosal from the Upper Jurassic Morrison Formation of Fruita, Colorado. | journal = Annals of Carnegie Museum | date = May 2015 | volume = 83 | issue = 1 | pages = 1–17 | doi = 10.2992/007.083.0101 | s2cid = 83598504 }}</ref> The position of [Allotheria](/source/Allotheria) (which contains the [multituberculates](/source/Multituberculata), among others) within Theriimorpha is controversial. While many studies recover Allotheria within crown Mammalia as more closely related to therians than to monotremes as a member of the clade [Theriiformes](/source/Theriiformes), some studies recover the group as outside of crown Mammalia.<ref>{{Cite journal |last1=Mao |first1=Fangyuan |last2=Li |first2=Zhiyu |last3=Wang |first3=Zhili |last4=Zhang |first4=Chi |last5=Rich |first5=Thomas |last6=Vickers-Rich |first6=Patricia |last7=Meng |first7=Jin |date=2024-04-03 |title=Jurassic shuotheriids show earliest dental diversification of mammaliaforms |url=https://www.nature.com/articles/s41586-024-07258-7 |journal=Nature |language=en |volume=628 |issue=8008 |pages=569–575 |bibcode=2024Natur.628..569M |doi=10.1038/s41586-024-07258-7 |issn=0028-0836 |pmid=38570681|url-access=subscription }}</ref>

==References==
{{reflist}}

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Category:Theriimorpha
Category:Mammal taxonomy

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Adapted from the Wikipedia article [Theriimorpha](https://en.wikipedia.org/wiki/Theriimorpha) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Theriimorpha?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.