Definitions
from The Century Dictionary.
- Those vertebrates which have no allantois; the Ichthyopsida, or amphibians and fishes: synonymous with Anamnionata, and opposed to Allantoidca.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms.
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