The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些以脱离水生的进化步骤卵改进。
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Unlike the temnospondyls, these early amniotes were free to reproduce far from the water, by laying eggs with protective shells, which were probably more leathery than mineralized.
与穿椎动不同, 这些早期的羊膜动可在远离水的地方自由繁殖,它们产下带有的卵,这些卵可能比矿化的更坚韧。
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