| Acristatherium Temporal range: Aptian |
|
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Subclass: | Eutheria |
| Genus: | Acristatherium Hu et al., 2010 |
| Species: | A. yanensis |
| Binomial name | |
| Acristatherium yanensis Hu et al., 2010 |
|
Acristatherium yanensis is an extinct basal eutherian from the Early Cretaceous (early Aptian, approximately 123 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 millimetres (0.98 in) long. It appears to possess a vestige of a septomaxilla, a feature only otherwise seen in non-mammalian therapsids.[1]