 Several groups of Mesozoic marine reptiles also exhibited viviparity, such as mosasaurs, ichthyosaurs, and Sauropterygia, a group that include pachypleurosaurs and Plesiosauria.Asexual reproduction has been identified in squamates in six families of lizards and one snake.In some species of squamates, a population of females is able to produce a unisexual diploid clone of the mother.