A zoological group or classification of animals that possess an allantois during embryonic development, including mammals and some reptiles.
From Greek 'allantois' (sausage-like) + '-dea' (plural suffix). This is a systematic biological classification term for animals sharing this developmental feature.
Allantoidea is one way biologists recognize that humans, dogs, birds, and snakes are all cousins—we all develop this same sausage-shaped membrane in the womb, proving deep evolutionary connections.
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