Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)

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Haemalopinus suis (Anoplura) and Menacanthus stramineus (Mallophaga) have been cytogenetically analyzed. Both species have 2n = 10, holokinetic chromosomes, and achiasmatic male meiosis. Bivalents orientate with their long axis perpendicular to the spindle fibers at melaphase I, and first anaphase i...

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Autores principales:	Tombesi, M.L., Papeschi, A.G.
Formato:	Artículo publishedVersion
Publicado:	1993
Materias:	animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00180661_v119_n1_p31_Tombesi https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00180661_v119_n1_p31_Tombesi_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

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spelling	I28-R145-paper_00180661_v119_n1_p31_Tombesi_oai2024-08-16 Tombesi, M.L. Papeschi, A.G. 1993 Haemalopinus suis (Anoplura) and Menacanthus stramineus (Mallophaga) have been cytogenetically analyzed. Both species have 2n = 10, holokinetic chromosomes, and achiasmatic male meiosis. Bivalents orientate with their long axis perpendicular to the spindle fibers at melaphase I, and first anaphase is reductional. As in other species of Phthiraptera, male gametogenesis follows a particular pattern: each cell entering meiosis results in a cyst of 64 (in H. suis) and 32 (in M. stramineus) spermatozoa and 64/32 non‐functional cells (=pycnotic nuclei). The results are compared with those previously reported for Phthiraptera, and a new terminology for the different stages of male gametogenesis is proposed. The low chromosome number together with the achiasmatic nature of male meiosis and the mitotic divisions that follow meiosis may restrict the potential for genetic variability. This might be related to the high host specificity of these parasites. Copyright © 1993, Wiley Blackwell. All rights reserved Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00180661_v119_n1_p31_Tombesi info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Hereditas 1993;119(1):31-38 animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta) info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00180661_v119_n1_p31_Tombesi_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic	animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa
spellingShingle	animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa Tombesi, M.L. Papeschi, A.G. Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
topic_facet	animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa
description	Haemalopinus suis (Anoplura) and Menacanthus stramineus (Mallophaga) have been cytogenetically analyzed. Both species have 2n = 10, holokinetic chromosomes, and achiasmatic male meiosis. Bivalents orientate with their long axis perpendicular to the spindle fibers at melaphase I, and first anaphase is reductional. As in other species of Phthiraptera, male gametogenesis follows a particular pattern: each cell entering meiosis results in a cyst of 64 (in H. suis) and 32 (in M. stramineus) spermatozoa and 64/32 non‐functional cells (=pycnotic nuclei). The results are compared with those previously reported for Phthiraptera, and a new terminology for the different stages of male gametogenesis is proposed. The low chromosome number together with the achiasmatic nature of male meiosis and the mitotic divisions that follow meiosis may restrict the potential for genetic variability. This might be related to the high host specificity of these parasites. Copyright © 1993, Wiley Blackwell. All rights reserved
format	Artículo Artículo publishedVersion
author	Tombesi, M.L. Papeschi, A.G.
author_facet	Tombesi, M.L. Papeschi, A.G.
author_sort	Tombesi, M.L.
title	Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
title_short	Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
title_full	Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
title_fullStr	Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
title_full_unstemmed	Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)
title_sort	meiosis in haematopinus suis and menacanthus stramineus (phthiraptera, insecta)
publishDate	1993
url	http://hdl.handle.net/20.500.12110/paper_00180661_v119_n1_p31_Tombesi https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00180661_v119_n1_p31_Tombesi_oai
work_keys_str_mv	AT tombesiml meiosisinhaematopinussuisandmenacanthusstramineusphthirapterainsecta AT papeschiag meiosisinhaematopinussuisandmenacanthusstramineusphthirapterainsecta
_version_	1809357056965083136

Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta)

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