IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
artículos
Título:
Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea) and their relation to mating system.
Autor/es:
GREGATI, R.A., FRANSOZO, V., LÓPEZ GRECO, L.S., NEGREIROS FRANSOZO M.L., BAUER, R.T,
Revista:
INVERTEBRATE BIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2014 vol. 133 p. 381 - 393
ISSN:
1077-8306
Resumen:
The morphology of the reproductive system of a stenopodidean decapod is described here for the first time with an interpretation of the sperm transfer process. Adult pairs of Stenopus hispidus were maintained under laboratory conditions; reproductive cycles were followed and mating behavior and sperm transfer were recorded with video camera for analysis. After copulation, the shrimps were anesthetized and dissected to record the shape and location of the gonads, and pleopod morphology was described and illustrated. The reproductive systems (RS), thoracic sterna and male and female genitalia were observed with the assistance of scanning electron microscopy. The male RS was restricted to the cephalothorax, and was highly reduced compared to that of other decapods. Only the first pair of pleopods may be involved in the sperm transfer process; there was no appendix masculina on the second pair of pleopods as in many other decapods. The ovaries of a pre-spawning female occupied much of the cephalothorax and reached to the 3rd abdominal segment. The oviducts were short and simple, without structures for sperm storage. We conclude that the male deposits a simple spermatophoric mass onto the posteroventral surface of the female and fertilization occurs externally as mature oocytes are subsequently spawned. This mode of sperm transfer and egg fertilization is ancestral within the decapod suborder Pleocyemata. As in some other animals, the relatively small size of the testes in S. hispidus may be related to their monogamous mating system, which may minimize selection for a large volume of sperm production.