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- One low opening (beneath the postorbital and squamosal bones). A monophyletic group including mammals and their ancestors.
* Euryapsida - One high opening (above the postorbital and squamosal bones). Euryapsids are a polyphyletic group, as reptiles with euryapsid skulls lack a shared common ancestor. Euryapsids evolved from a diapsid configuration, losing their lower temporal fenestra. Examples

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