Early development and implantation in the rat-tailed bat,Rhinopoma microphyllum (Brunnich)—Rhinopomatidae—Microchiroptera
Rhinopoma microphyllum breeds once a year in a sharply defined season. It is monotocous, the two sides of the female genitalia being equally functional, although only one at a time. The embryo reaches the uterus as an early morula. Implantation is superficial and circumferential with the embryonic mass oriented towards the mesometrial side. The primitive amnion is formed by cavitation and the definitive amnion is formed by the development of folds. The yolk-sac develops as in all other bats. The definitive placenta is discoid, mesometrial, labyrinthine and vasodichorial.