Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system

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. Pairs of adults of Stenopus hispidus were maintained under laboratory conditions to observe reproductive cycles. Mating behavior and sperm...

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Autores principales: Gregati, R.A., Fransozo, V., López-Greco, L.S., Negreiros-Fransozo, M.L., Bauer, R.
Formato: JOUR
Materias:
Fertilization
Insemination
Monogamy
Ovary
Testes
Animalia
Crustacea
Decapoda (Crustacea)
Pleocyemata
Stenopodidea
Stenopus hispidus
Sterna
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10778306_v133_n4_p381_Gregati
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10778306_v133_n4_p381_Gregati2023-10-03T16:03:34Z Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system Gregati, R.A. Fransozo, V. López-Greco, L.S. Negreiros-Fransozo, M.L. Bauer, R. Fertilization Insemination Monogamy Ovary Testes Animalia Crustacea Decapoda (Crustacea) Pleocyemata Stenopodidea Stenopus hispidus Sterna 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. Pairs of adults of Stenopus hispidus were maintained under laboratory conditions to observe reproductive cycles. Mating behavior and sperm transfer were video-recorded 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 by scanning electron microscopy. The male reproductive system was restricted to the cephalothorax and was highly reduced compared with 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 prespawning females 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 the monogamous mating system, which may minimize selection for a large volume of sperm production. © 2014, The American Microscopical Society, Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10778306_v133_n4_p381_Gregati
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Fertilization
Insemination
Monogamy
Ovary
Testes
Animalia
Crustacea
Decapoda (Crustacea)
Pleocyemata
Stenopodidea
Stenopus hispidus
Sterna
spellingShingle Fertilization
Insemination
Monogamy
Ovary
Testes
Animalia
Crustacea
Decapoda (Crustacea)
Pleocyemata
Stenopodidea
Stenopus hispidus
Sterna
Gregati, R.A.
Fransozo, V.
López-Greco, L.S.
Negreiros-Fransozo, M.L.
Bauer, R.
Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
topic_facet Fertilization
Insemination
Monogamy
Ovary
Testes
Animalia
Crustacea
Decapoda (Crustacea)
Pleocyemata
Stenopodidea
Stenopus hispidus
Sterna
description 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. Pairs of adults of Stenopus hispidus were maintained under laboratory conditions to observe reproductive cycles. Mating behavior and sperm transfer were video-recorded 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 by scanning electron microscopy. The male reproductive system was restricted to the cephalothorax and was highly reduced compared with 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 prespawning females 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 the monogamous mating system, which may minimize selection for a large volume of sperm production. © 2014, The American Microscopical Society, Inc.
format JOUR
author Gregati, R.A.
Fransozo, V.
López-Greco, L.S.
Negreiros-Fransozo, M.L.
Bauer, R.
author_facet Gregati, R.A.
Fransozo, V.
López-Greco, L.S.
Negreiros-Fransozo, M.L.
Bauer, R.
author_sort Gregati, R.A.
title Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
title_short Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
title_full Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
title_fullStr Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
title_full_unstemmed Functional morphology of the reproductive system and sperm transfer in Stenopus hispidus (Crustacea: Decapoda: Stenopodidea), and their relation to the mating system
title_sort functional morphology of the reproductive system and sperm transfer in stenopus hispidus (crustacea: decapoda: stenopodidea), and their relation to the mating system
url http://hdl.handle.net/20.500.12110/paper_10778306_v133_n4_p381_Gregati
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