anamniotes
A zoological term for vertebrates that lack an amnion during embryonic development, i.e., fish and amphibians. Used in biological classification.
Fish and amphibians are classified as anamniotes.
Amniotes, the group that includes reptiles, birds, and mammals, which possess an amnion.
From 無 (mu, 'without') + 羊膜 (yōmaku, 'amnion') + 類 (rui, 'group, category'). A modern scientific compound.