An early embryonic stage characterized by a disc-shaped gastrula (three-layered embryo), particularly in eggs with large yolks.
From disco- (disc) + gastrula (from Greek gastro-, 'stomach'). This embryology term describes the specific stage when a disc-shaped embryo develops its three germ layers.
When a chicken egg is forming, the embryo exists as a flat disc, and when it reaches the gastrula stage it's called a discogastrula—scientists have names for every tiny change in development.
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