Observation of some key stages of the embryonic development of Biomphalaria straminea (Dunker, 1848) (Molluska, Planorbidae) - Kawano, Toshie; Watanabe, Liz Cristina; Nakano, Eliana; Medeiros Y Araujo, Carla M.; Caldeira, Waldir; Ribeiro, Alberto de Freitas; Spring, Herbert (Invertebrate Reproduction and Development, 2004)