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Acristatherium yanensis is an
extinct basal eutherian from the
Early Cretaceous (early Aptian,
about 125 million
years ago)
Lujiatun Bed of the Yixian...
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within Placentalia sensu stricto) ?Genus †Juramaia
Genus †Eomaia
Genus †
Acristatherium Clade †Tamirtheria ? (monophyly disputed)
Genus †Prokennalestes ?Genus...
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Acristatherium Microtherulum Cokotherium...
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premaxilla called the septomaxilla.
Because this bone is
vestigial in
Acristatherium (a
Cretaceous eutherian) this
species is
believed to be the
oldest known...
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known metatherian. This
makes it
almost contemporary to the
eutherian Acristatherium,
which has been
found in the same area. However, Bi et al. (2018) reinterpreted...
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Acristatherium, and
Sinodelphys at the base of Eutheria. In 2022, the new
Jehol eutherian Cokotherium was
added to the clade,
while Acristatherium shifted...
- †
Acristatherium? †Ambolestes? †Bayshinoryctes †Bobolestes? †Cokotherium? †Durlstodon †Durlstotherium †Endotherium †Eomaia? †Hovurlestes †Hyotheridium?...
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Acristatherium? †Ambolestes? †Bayshinoryctes †Bobolestes? †Cokotherium? †Durlstodon †Durlstotherium †Endotherium †Eomaia? †Hovurlestes †Hyotheridium?...
- †
Acristatherium? †Ambolestes? †Bayshinoryctes †Bobolestes? †Cokotherium? †Durlstodon †Durlstotherium †Endotherium †Eomaia? †Hovurlestes †Hyotheridium?...
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ubiquitous Psittacosaurus as well as Liaoceratops.
Mammals present included Acristatherium, Gobiconodon, Juchilestes, Maotherium, Meemannodon, and Repenomamus...
