Around 340 million years ago, the next major leap in egg evolution came with the first amniotes, not reptiles specifically. These animals evolved the amniotic egg, with protective membranes and, in many lineages, a shell that supported development away from open water. That innovation helped free reproduction from aquatic settings and later passed into both the synapsid line, which led to mammals, and the sauropsid line, which led to reptiles, dinosaurs, pterosaurs, and birds.
Amniotes Emerge: Amniotic Eggs
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Amniotes Emerge: Amniotic Eggs
340 Million years ago (+/- 10 million)
Ancestor or reptiles, birds, and mammals.
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The amniotic egg evolved in the first amniotes, which evolved into today’s reptiles, birds, and mammals.
Subject: Evolution.
Around 340 million years ago, the first amniotes evolved eggs with specialized membranes that freed reproduction from open water. That innovation later passed into both great branches: synapsids, which led to mammals, and sauropsids, which led to reptiles, pterosaurs, dinosaurs, and birds.
Flashcard.
The vertebrate group after fish that gave rise to amphibians, reptiles, birds, and mammals..
Answer. Tetrapods.
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