کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2203928 1100536 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sperm structure and ultrastructure of the Melittobia hawaiiensis, Perkins and M. australica, Girault (Chalcidoidea: Eulophidae)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Sperm structure and ultrastructure of the Melittobia hawaiiensis, Perkins and M. australica, Girault (Chalcidoidea: Eulophidae)
چکیده انگلیسی

Spermatozoa morphology has, for some years, been used to help answer some phylogenetic questions for Hymenoptera. This is the second study describing spermatozoa morphology of an Eulophidae species in which important characteristics were observed. Melittobia spermatozoa are spiralled and measure approximately 270 μm in length. The head contains a small acrosome, apparently formed only by an acrosomal vesicle, which, together with the initial nuclear region, is surrounded by an extracellular sheath, from which innumerable filaments irradiate. The nucleus is helicoidal and completely filled with compact chromatin. A centriolar adjunct is observed at the nucleus–flagellum transition; it associates laterally with the nucleus and exhibits two small expansions, which reach around the centriole. In the flagellum there are two mitochondrial derivatives, which in cross-sections are asymmetric. In the derivative with the larger diameter, two distinct regions are observed, a small one, near the axoneme, with a clear “fissure” inside, and a larger region where the cristae occur. Both derivatives initiate at the nuclear base, but the larger diameter derivative finishes first, before the flagellum extremity. At the end of the axoneme, the accessory microtubules are the first to finish.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tissue and Cell - Volume 41, Issue 2, April 2009, Pages 113–117
نویسندگان
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