Both of these evolutionary improvements needed the previous growth of interior fertilization. To put it differently, the deposition of semen because of the male to the female’s reproductive tract as well as the sperm’s subsequent penetration for the ovum had been necessary ahead of the shelled egg could occur.
In residing reptiles the deposition of this male’s semen ins > penis (such as turtles order Testudines and crocodiles order Crocodylia, or Crocodilia) or hemipenes (such as lizards and snakes order Squamata). Your penis is a homologue of this mammalian penis, as well as its existence in reptiles shows that this organ arose early in the development associated with amniotes and ahead of the origin of reptiles and synapsids.