Acristatherium

Acristatherium; Temporal range: Early Cretaceous, 125 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
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]

References

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 (eds.). Recent advances in Chinese palaeontology. Proceedings of the Royal Society B. 277. pp. 229–236. doi:10.1098/rspb.2009.0203. PMC 2842663. PMID 19419990.

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[acristatherium-1] 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 (eds.). Recent advances in Chinese palaeontology. Proceedings of the Royal Society B. 277. pp. 229–236. doi:10.1098/rspb.2009.0203. PMC 2842663. PMID 19419990.