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Temporal range: Late Triassic to Jurassic
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Haramiyida
Clade: Euharamiyida
Bi, Wang, Guan, Sheng, & Meng, 2014

Euharamiyids were a clade of early mammals or mammal-like cynodonts from the Jurassic Period in China. The group is sometimes considered a sister group to Multituberculata,[1] or part of an earlier divergence within the synapsid line.[2][3]


By studying Euharamiyida, Bi et al. (2014) came to the conclusion that mammals evolved during the late Triassic, with allotherians diverging into Euharamiyids and Multituberculates around 208 million years ago from a common Haramiyavia-like ancestor.[1] However, more recent studies showcase that euharamiyidans are more basal Mammaliaformes, outside of crown-group Mammalia, rendering Allotheria obsolete.[2][3]








X. linglong

X. songae

Cladogram of Euharamiyida


  1. ^ a b Bi, Shundong; Wang, Yuanqing; Sheng, Xia; Meng, Jin (10 September 2014). "Three new Jurassic euharamiyidan species reinforce early divergence of mammals". Nature. Nature Publishing Group. 514 (7524): 579–584. doi:10.1038/nature13718. PMID 25209669.
  2. ^ a b Chang, Kenneth (16 November 2015). "Jawbone in Rock May Clear Up a Mammal Family Mystery". New York Times. Retrieved 17 November 2015.
  3. ^ a b Luo, Zhe-Xi; Gates, Stephen M.; Jenkins Jr., Farish A.; Amaral, William W.; Shubin, Neil H. (16 November 2015). "Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution". PNAS. 112 (51): E7101–E7109. doi:10.1073/pnas.1519387112. PMC 4697399. PMID 26630008. Retrieved 17 November 2015.
  4. ^ X.-Z. Luo, Q.-J. Meng, D. M. Grossnickle, D. Lui, A. I. Neander, Y.-G. Zhang, and Q. Ji. 2017. New evidence for mammaliaform ear evolution and feeding adaptation in a Jurassic ecosystem. Nature 548:326-329.