Arboroharamiya
Arboroharamiya | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Synapsida |
Clade: | Therapsida |
Clade: | Cynodontia |
Clade: | Mammaliaformes |
Order: | †Haramiyida |
Genus: | †Arboroharamiya Zheng et al., 2013 |
Species | |
†Arboroharamiya jenkinsi |
Arboroharamiya is an extinct
When Arboroharamiya was included in a
Description
Arboroharamiya is the largest known haramiyidan, estimated to have weighed about 354 g. It has several features in common with living mammals, including a lower jaw formed by a single bone, the
Relationships
Arboroharamiya belongs to a clade or evolutionary grouping called Mammaliaformes, which includes mammals and their closest extinct relatives from the Triassic and Jurassic periods. Within Mammaliaformes, Arboroharamiya falls within the clade Haramiyida. Haramiyidans have been known since the 1840s, but only from fossilized teeth and a single partial lower jaw. However, several features of the teeth have shown for many years that haramiyidans are among the most basal of mammaliaforms. Recent phylogenetic analyses, or analyses of evolutionary relationships, differ on whether or not haramiyidans are true mammals in the crown group Mammalia (the clade including the most recent common ancestor of living mammals, and all its descendants). Some analyses place Haramiyida outside crown group Mammalia, meaning that they diverged from other mammaliaforms before the most recent common ancestor of living mammals appeared. Other analyses place Haramiyida within Mammalia as part of an extinct group of Mesozoic mammals called Allotheria, which also includes Multituberculata. When Arboroharamiya itself was incorporated into a phylogenetic analysis, Haramiyida fell within Allotheria as a group within Mammalia. Below is a cladogram or evolutionary tree from the analysis:
Mammaliaformes |
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