Eomaia scansoria (Ji et al. 2002) Barremian, Early Cretaceous ~125 mya, ~10 cm in length) was originally considered a basal eutherian mammal, but not a placental mammal. Here it nests as a basal marsupial alongside the extant numbat, Myrmecobius. Distinct from Myrmecobius the mandible of Eomaia had a larger canine. The molars were more asymmetrical in shape, with taller cusps. The metatarsals were more nearly subequal as were all the non-ungual phalanges.

Cokotherium jiufotangensis (Ji et al. 2002) Barremian, Early Cretaceous ~125 mya, ~10 cm in length) is a sister to Eomaia in the LRT. This µCT scan helps one understand the more nebulous data on Eomaia.

Ji et al 2002. The earliest known eutherian mammal, Nature 416:816-822.

Temminck CJ 1824. Monogr. Mamm. vol.1 p.23, 56.

Wang H-B, Hoffmann S, Wang D-C, Wang Y-Q. 2022. A new mammal from the Lower Cretaceous Jehol Biota and implications for eutherian evolution. Phil. Trans. R. Soc. B 377: 20210042. https://doi.org/10.1098/rstb.2021.0042

wiki/Eomaia
wiki/Cokotherium