- 1. n. pl. The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. Source: opted
- 2. The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. Source: webster
- 3. The division of Vertebrata in which the embryo develops anallantois. It includes reptiles, birds, and mammals. Source: adambom
- 4. n. pl. The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. Source: ecdict
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