Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae)
The ultrastructure of spermatogenesis, the euspermatozoa and paraspermatozoa, is investigated in Trophon geversianus. Spermatogenesis follows the general developmental pattern of caenogastropods. Paraspermatid development is characterized by elongation of the cell, concurrent with the appearance of...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253154_v93_n7_p1881_Gimenez http://hdl.handle.net/20.500.12110/paper_00253154_v93_n7_p1881_Gimenez |
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paper:paper_00253154_v93_n7_p1881_Gimenez2023-06-08T14:52:54Z Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) Giménez, Juliana Gastropoda Muricidae parasperm Reproduction south-western Atlantic gastropod geographical distribution new species species diversity sperm competition taxonomy ultrastructure Caenogastropoda Gastropoda Muricidae Neogastropoda Trophon geversianus The ultrastructure of spermatogenesis, the euspermatozoa and paraspermatozoa, is investigated in Trophon geversianus. Spermatogenesis follows the general developmental pattern of caenogastropods. Paraspermatid development is characterized by elongation of the cell, concurrent with the appearance of a cytoplasmic elongation at the apex of the cell and the breakdown of the nucleus into small round fragments (caryomerites). Euspermatozoa consist of: a tall, conical acrosomal vesicle (with a invagination); a rod-shaped, highly electron-dense nucleus with an internal axoneme; an elongate midpiece consisting of the axoneme sheathed by helical mitochondrial elements; an elongate glycogen piece; and a short free-tail region. Paraspermatozoa of T. geversianus are vermiform. They contain approximately 12-16 axonemes arranged peripherally, numerous oblong dense vesicles, numerous less dense (round) vesicles, and scattered mitochondria. Most of the euspermatozoal features of T. geversianus are also observed in many neogastropods. However, the presence of the axoneme continuously located inside of the nucleus has not been reported before, and may prove to be a diagnostic feature of the Muricidae. © 2013 Marine Biological Association of the United Kingdom. Fil:Gimenez, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253154_v93_n7_p1881_Gimenez http://hdl.handle.net/20.500.12110/paper_00253154_v93_n7_p1881_Gimenez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Gastropoda Muricidae parasperm Reproduction south-western Atlantic gastropod geographical distribution new species species diversity sperm competition taxonomy ultrastructure Caenogastropoda Gastropoda Muricidae Neogastropoda Trophon geversianus |
| spellingShingle |
Gastropoda Muricidae parasperm Reproduction south-western Atlantic gastropod geographical distribution new species species diversity sperm competition taxonomy ultrastructure Caenogastropoda Gastropoda Muricidae Neogastropoda Trophon geversianus Giménez, Juliana Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| topic_facet |
Gastropoda Muricidae parasperm Reproduction south-western Atlantic gastropod geographical distribution new species species diversity sperm competition taxonomy ultrastructure Caenogastropoda Gastropoda Muricidae Neogastropoda Trophon geversianus |
| description |
The ultrastructure of spermatogenesis, the euspermatozoa and paraspermatozoa, is investigated in Trophon geversianus. Spermatogenesis follows the general developmental pattern of caenogastropods. Paraspermatid development is characterized by elongation of the cell, concurrent with the appearance of a cytoplasmic elongation at the apex of the cell and the breakdown of the nucleus into small round fragments (caryomerites). Euspermatozoa consist of: a tall, conical acrosomal vesicle (with a invagination); a rod-shaped, highly electron-dense nucleus with an internal axoneme; an elongate midpiece consisting of the axoneme sheathed by helical mitochondrial elements; an elongate glycogen piece; and a short free-tail region. Paraspermatozoa of T. geversianus are vermiform. They contain approximately 12-16 axonemes arranged peripherally, numerous oblong dense vesicles, numerous less dense (round) vesicles, and scattered mitochondria. Most of the euspermatozoal features of T. geversianus are also observed in many neogastropods. However, the presence of the axoneme continuously located inside of the nucleus has not been reported before, and may prove to be a diagnostic feature of the Muricidae. © 2013 Marine Biological Association of the United Kingdom. |
| author |
Giménez, Juliana |
| author_facet |
Giménez, Juliana |
| author_sort |
Giménez, Juliana |
| title |
Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| title_short |
Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| title_full |
Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| title_fullStr |
Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| title_full_unstemmed |
Spermatogenesis and sperm morphology in Trophon geversianus (Gastropoda: Muricidae) |
| title_sort |
spermatogenesis and sperm morphology in trophon geversianus (gastropoda: muricidae) |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253154_v93_n7_p1881_Gimenez http://hdl.handle.net/20.500.12110/paper_00253154_v93_n7_p1881_Gimenez |
| work_keys_str_mv |
AT gimenezjuliana spermatogenesisandspermmorphologyintrophongeversianusgastropodamuricidae |
| _version_ |
1768546527274336256 |