S. Tekaya et al., SPERM TRANSFER AND FERTILIZATION IN THE MARINE PLANARIAN SABUSSOWIA-DIOICA (PLATYHELMINTHES, TRICLADIDA, MARICOLA), INVERTEBRATE REPRODUCTION & DEVELOPMENT, 32(2), 1997, pp. 143-147
It has been established that in the gonochoristic marine planarian Sab
ussowia dioica (Claparede, 1863), the male animal produces sclerotic s
permatophores that are deposited onto the body wall of the female. Spe
rm contained in these capsules penetrate the parenchyma and eventually
enter the ovaries and the anterior vitellarian follicles. External de
position of spermatophores is unique within the triclads, while format
ion of spermatophores is unique within the marine planarians.