An early embryonic stage having two primary germ layers, representing development between the blastula and gastrula stages in some organisms.
From di- (two) + blastula (early embryo stage). This embryological term emerged in 19th-century comparative biology as scientists studied developmental stages across species.
The diblastula represents a crucial moment in evolution—the point where life first developed true tissue layers, a breakthrough that allowed animals to become more complex than simple sponges.
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