کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1589782 1002008 2010 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The first cytogenetic characterization of the poisonous black widow spider Latrodectus gr. curacaviensis from Brazil, with chromosomal review of the family Theridiidae (Arachnida, Araneae)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
The first cytogenetic characterization of the poisonous black widow spider Latrodectus gr. curacaviensis from Brazil, with chromosomal review of the family Theridiidae (Arachnida, Araneae)
چکیده انگلیسی

In this paper we present, for the first time, cytogenetical data on Latrodectus gr. curacaviensis (Theridiidae) from Brazil, as well as the first data on meiosis and sex chromosome system of this genus. Testes were submitted to colchicine, hypotonic, and fixation treatment, and chromosomal preparations were stained with Giemsa solution. The analysis showed 2n = 26 telo/acrocentric chromosomes in spermatogonial metaphases. Metaphase I exhibited 12 autosomal bivalents and two sex chromosome univalents (12II + X1X2). All bivalents revealed one terminal chiasma. Metaphases II confirmed the sex chromosome system, showing 12 autosomes or 12 autosomes plus two X chromosomes, respectively. Male karyotype prevailing in theridiids is formed by 2n = 22 chromosomes, including sex chromosome system X1X2 in all species. The Latrodectus species of the geometricus clade analyzed until now showed smaller diploid number (2n♀ = 16 and 2n♀ = 18) than the species of the mactans clade (2n♀ = 24 and 2n♀ = 26). Thus, according to the chromosome number, the examined Latrodectus species seems to be related to the mactans clade.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Micron - Volume 41, Issue 2, February 2010, Pages 165–168
نویسندگان
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