However, recent studies have revealed that cimolestans are more likely to be basal, non-placental eutherians, with no living descendants.
22.
Taeniodonts are unambiguously non-placental eutherians, and part of Cimolesta; " Cimolestes " is the immediate outgroup to Taeniodonta.
23.
Placentals are unique among all mammals, including other eutherians, in having lost epipubic bones and having been able to develop proper pregnancy.
24.
It is the earliest known representative of Taeniodonta, a specialised lineage of non-placental eutherian mammals otherwise found in Paleocene and Eocene deposits.
25.
These pouches can often be exposed to maternal faeces and urine, a highly different environment to the sterile intrauterine environment seen in eutherian embryos.
26.
However, unlike eutherian mammals, epitheliochorial placentation is not maintained by maternal tissue as embryos do not readily invade maternal tissue outside of the uterus.
27.
In 1960, Medawar and Burnet were awarded the immunological mechanisms that mediate protection of the developing eutherian fetus from the immune responses of its mother.
28.
One model for the induction of tolerance during the very early stages of pregnancy is the Eutherian Fetoembryonic Defense System ( eu-FEDS ) hypothesis.
29.
The Zalambdalestidae are almost certainly unrelated to any of these groups; they probably represent more basal Eutherians and might not even be true Eutherians at all.
30.
The Zalambdalestidae are almost certainly unrelated to any of these groups; they probably represent more basal Eutherians and might not even be true Eutherians at all.
