What are the signs that bring oviparous animals closer to reptiles?

Oviparous are mammals, but they have a number of features that bring them closer to their reptile ancestors. First and foremost, like mammals, they reproduce by laying eggs (unlike other mammals that give birth to young). Secondly, like reptiles, they have a cloaca (and not separate anal and urogenital openings). Finally, there is a peculiarity of the skeleton: they retain the so-called coracoid (aka “crow’s bone”), located in the shoulder girdle.