As synapsids continued to evolve during the Permian Period, however, they lost their belly ribs. Creatures like our cynodont ancestors, as well as the saber-toothed gorgonopsians, didn’t have ...

The Synapsid and Parareptile Collection includes both non-mammalian synapsids and Mesozoic mammaliaformes. The first collections at the Museum were acquired in 1853, with the transfer from the ...

It involved a major reorganization of limb anatomy and function in synapsids—the group that includes both mammals and their non-mammalian ancestors—eventually leading to the therian mammals ...

He says, 'The Triassic is an interesting period. It forms the transition between the late Palaeozoic Era, which was mainly populated by synapsids, or mammal-like reptiles, and the Mesozoic Era, when ...

The initial split was into synapsids (mammals and their relatives) and sauropsids (reptiles and birds). Mammals branched off from other amniotes very early. Several mammalian characteristics are ...