Sexual selection: placentation, superfetation, and coercive copulation
Publication information:
Haig. Sexual selection: placentation, superfetation, and coercive copulation. Curr Biol. 2014;24:R805–8.
Abstract
The evolution of placentas in poeciliid fishes is associated with conception of overlapping litters and male mating strategies becoming more coercive. Sperm competition in ovaries of multiply-inseminated females may favor fertilization of immature eggs during ongoing pregnancies.