Poeciliidae
P. elongata, P. turneri, and P. presidionis form an outgroup to the P. monacha, P.lucida, and P. prolifica group. These three fish are very matrotrophic. In 1947, C. L. Turner said the follicular cells of P. turneri were "pseudo-placenta, pseudo-chorion, and pseudo-allantois." The greater degree of matrotrophy in a species is linked with a higher degree of placentation, including "a thicker maternal follicle, higher degree of vascularization, and greater number of villi in the placenta."