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Temporal range: Early Cretaceous, 125 Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Clade: Eutheria
Genus: Acristatherium
Hu et al., 2010
Type species
Acristatherium yanensis
Hu et al., 2010

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]


  1. ^ a b c Yaoming Hu; Jin Meng; Chuankui Li; Yuanqing Wang (2010). "New basal eutherian mammal from the Early Cretaceous Jehol biota, Liaoning, China" (PDF). In Xing Xu; Zhe-Xi Luo; Jia-Yu Rong. Recent advances in Chinese palaeontology. Proceedings of the Royal Society B. 277. pp. 229–236. PMC 2842663Freely accessible. PMID 19419990. doi:10.1098/rspb.2009.0203.