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

Mostrar todas las versiones(3)

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...

Descripción completa

Detalles Bibliográficos
Autores principales:	Tombesi, M.L., Papeschi, A.G.
Formato:	JOUR
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
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00180661_v119_n1_p31_Tombesi
record_format	dspace
spelling	todo:paper_00180661_v119_n1_p31_Tombesi2023-10-03T14:15:10Z Meiosis in Haematopinus Suis and Menacanthus Stramineus (Phthiraptera, Insecta) Tombesi, M.L. Papeschi, A.G. animal cell article female male meiosis nonhuman oocyte maturation parasite spermatogenesis swine Animalia Haematopinus suis Insecta Menacanthus Phthiraptera Sus scrofa 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00180661_v119_n1_p31_Tombesi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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	JOUR
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)
url	http://hdl.handle.net/20.500.12110/paper_00180661_v119_n1_p31_Tombesi
work_keys_str_mv	AT tombesiml meiosisinhaematopinussuisandmenacanthusstramineusphthirapterainsecta AT papeschiag meiosisinhaematopinussuisandmenacanthusstramineusphthirapterainsecta
_version_	1807321909746991104

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

Ejemplares similares