Acristatherium yanensis is an extinct basal eutherian from the Early Cretaceous (early Aptian, about 125 million years ago) Lujiatun Bed of the Yixian Formation.[1] It was described on the basis of a single specimen (holotype) from Beipiao, Liaoning, China, by Yaoming Hu, Jin Meng, Chuankui Li, and Yuanqing Wang in 2010.[1] The specimen comprises a partial skull, 25 mm (0.98 in) long. It appears to possess a vestige of a septomaxilla, a feature only otherwise seen in nonmammalian therapsids.[1]
| Acristatherium Temporal range: Early Cretaceous,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Clade: | Eutheria |
| Genus: | †Acristatherium Hu et al., 2010 |
| Type species | |
| †Acristatherium yanensis Hu et al., 2010
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References
edit- ^ a b c Yaoming Hu; Jin Meng; Chuankui Li; Yuanqing Wang (2010). "New basal eutherian mammal from the Early Cretaceous Jehol biota, Liaoning, China". In Xing Xu; Zhe-Xi Luo; Jia-Yu Rong (eds.). Recent advances in Chinese palaeontology. Vol. 277. pp. 229–236. doi:10.1098/rspb.2009.0203. PMC 2842663. PMID 19419990.
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