Paleobiologist argues that earliest land dwelling amniotes were likely egg layers

(Phys.org) -- Animals that generate a protective layered environment in which their offspring develop are known as amniotes, regardless of whether they give birth to them or lay them as eggs. This group includes mammals and reptiles. But because of scant archeological evidence, no one really knows whether the first land dwelling amniotes were egg layers or whether they gave birth to their offspring. And while evidence of late has suggested that it might be the latter, paleobiologist Martin Sander from the University of Bonn, argues in a perspective piece in the journal Science, that it’s more likely they were egg layers.

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