aplacental

adj.

（低等哺乳动物）无胎盘的（如袋鼠）；

A new class of DNA photolyases present in various organisms including aplacental mammals.
Morphological and endocrine correlates of the reproductive cycle of the aplacental viviparous dogfish, Squalus acanthias.
Ovarian structural specializations facilitate aplacental matrotrophy in Jenynsia lineata (cyprinodontiformes, osteichthyes)
Mother-embryo isotope (δ¹⁵N, δ¹³C) fractionation and mercury (Hg) transfer in aplacental deep-sea sharks
THE INTERRUPTION OF PREGNANCY BY OVARIECTOMY IN THE APLACENTAL OPOSSUM: A STUDY IN THE PHYSIOLOGY OF IMPLANTATION
Early Death of the Mammalian Ovum with Special Reference to the Aplacental Opossum
Altered Growth Following Gestational Viral Infection of the Placental and Aplacental Host
BRIEF COMMUNICATION Mother–embryo isotope (