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The therapsids, creatures that just preceded mammals, had a fourth region, the pectoral.

And while the team has yet to uncover any therapsids, Angielczyk says, the explorations have turned up a variety of other odd fossils.

Life is discovered on Mars in the shape of fish-lizard creatures called therapsids, although it is not plain how these beasts are able to subsist without any larger ecosystem.

His current research involves studying how the major groups of therapsids are related, a topic that has received surprisingly little attention from paleontologists.

Moreover, if the formation is from the later parts of the Early Permian, it is roughly the age when we would expect early therapsids to be present.