Haramiyida
Extinct order of mammaliaforms / From Wikipedia, the free encyclopedia
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Haramiyida is a possibly polyphyletic order of mammaliaform cynodonts or mammals of controversial taxonomic affinites.[2] Their teeth, which are by far the most common remains, resemble those of the multituberculates. However, based on Haramiyavia, the jaw is less derived; and at the level of evolution of earlier basal mammals like Morganucodon and Kuehneotherium, with a groove for ear ossicles on the dentary.[3] Some authors have placed them in a clade with Multituberculata dubbed Allotheria within Mammalia.[4][5] Other studies have disputed this and suggested the Haramiyida were not crown mammals, but were part of an earlier offshoot of mammaliaformes instead.[6] It is also disputed whether the Late Triassic species are closely related to the Jurassic and Cretaceous members belonging to Euharamiyida/Eleutherodontida, as some phylogenetic studies recover the two groups as unrelated, recovering the Triassic haramiyidians as non-mammalian cynodonts, while recovering the Euharamiyida as crown-group mammals closely related to multituberculates.[7]
Haramiyida | |
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Lower jaw and restoration of Haramiyavia, a basal haramiyidan from the Triassic of Greenland | |
Skull of Xianshou, a euharamiyidan from the Jurassic of China | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Synapsida |
Clade: | Therapsida |
Clade: | Cynodontia |
Clade: | Mammaliaformes |
Order: | †Haramiyida Hahn, Sigogneau-Russell & Wouters, 1989 |
Subgroups | |
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