Egg maturation and parthenogenetic recovery of diploidy in the scorpionLiocheles australasiae (Fabricius) (Scorpions, Ischnuridae)

Yamazaki, Kazunori; Yahata, Hiroko; Kobayashi, Nobuaki; Makioka, Toshiki

doi:10.1002/1097-4687(200101)247:1<39::aid-jmor1002>3.0.co;2-h

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…Shanahan (1989a, b) describes a few ''putative metaphase I'' on females of Lychas mamoreus, Lychas variatus (Buthidae) and Urodacus manicatus (Urodacidae) with chromosomal bodies that were similar to the achiasmate bivalents found on males of these species. Finally, in a detailed histological work of the parthenogenetic scorpion Liocheles australasiae (Hormuridae), Yamazaki et al (2001) describe the course of meiosis in serial sections, but in the karyological observations there is no mention about the chiasmatic or achiasmatic nature of the meiotic division.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, information about female meiosis is scarce due to the difficulty of finding meiotic cells from ovariuteri preparations, as mentioned by Piza (1939), Shanahan (1989a) and Schneider et al (2009b). In only five species of scorpions some female meiotic characteristics were mentioned: Heterometrus madraspatensis Pocock 1900 (sub Palamnaeus fulvipes madraspatensis) (Scorpionidae Latreille 1802), Urodacus manicatus (Thorell 1876) (Urodacidae Pocock 1893), Liocheles australasiae (Fabricius 1775) (Hormuridae Laurie 1896), Lychas mamoreus (C. L. Koch 1844) and Lychas variatus (Thorell 1876) (Buthidae) (Nath 1925;Shanahan 1989a, b;Yamazaki et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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Male and female meiosis in the mountain scorpion Zabius fuscus (Scorpiones, Buthidae): heterochromatin, rDNA and TTAGG telomeric repeats

et al. 2015

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All cytogenetically studied scorpions present male achiasmatic meiosis and lack heteromorphic sex chromosomes. In contrast, information about female meiosis in scorpions is scarce due to the difficulty of finding meiotic cells. The genus Zabius includes three described species and no chromosome studies have been performed on it until now. We analyzed the constitutive heterochromatin distribution, NORs and telomeric sequences in mitosis and meiosis of males and females of different populations of Zabius fuscus. All specimens presented 2n = 18 holokinetic chromosomes that gradually decreased in size. Male meiosis presented nine bivalents and a polymorphism for one reciprocal translocation in one population. Telomeric signals were detected at every terminal region, confirming also the presence of a (TTAGG) n motif in Buthidae. Constitutive heterochromatin was found in three chromosome pairs at a terminal region; moreover, NORs were embedded in the heterochromatic region of the largest pair. Chromosome size and landmarks allowed us to propose the chromosomes involved in the rearrangement. In four females, cells at different prophase I stages were analyzed. We describe a diffuse stage and the presence of ring-shaped bivalents. We discuss the possible origin of these bivalents in the framework of chiasmatic or achiasmatic female meiosis. These results contribute to increase the scarce evidence of female meiosis in scorpions and raise new questions about its mechanism.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Male and female meiosis in the mountain scorpion Zabius fuscus (Scorpiones, Buthidae): heterochromatin, rDNA and TTAGG telomeric repeats

et al. 2015

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“…in the sawfly Pristiphora pallipes : Comrie, 1938; the termite Reticulitermes speratus : Matsuura, Fujimoto & Goka, 2004; the fruit fly Drosophila parthenogenetica : Suomalainen et al. , 1987; and the scorpion Liocheles australasiae : Yamazaki et al. , 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Each of these is derived from the secondary oocyte (e.g. in the sawfly Pristiphora pallipes: Comrie, 1938; the termite Reticulitermes speratus: Matsuura, Fujimoto & Goka, 2004; the fruit fly Drosophila parthenogenetica: Suomalainen et al, 1987; and the scorpion Liocheles australasiae: Yamazaki et al, 2001). In other cases, diploidy is recovered by fusion of the egg nucleus with one of the non-sister nuclei derived from the first polar body, or else by fusion of two of the non-sister polar bodies (i.e.…”

Section: Discussionmentioning

confidence: 99%

Automictic parthenogenesis of a geographically parthenogenetic mayfly, Ephoron shigae (Insecta: Ephemeroptera, Polymitarcyidae)

Sekiné¹,

Tojo²

2009

Biological Journal of the Linnean Society

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In the geographically parthenogenetic mayfly, Ephoron shigae, egg maturation and counts of chromosome number of unfertilized, parthenogenetic eggs were studied, in comparison with fertilized eggs from a bisexual population. The primary oocyte becomes mature through two successive maturation divisions. The first maturation division (meiotic division) takes place in the primary oocyte to produce a secondary oocyte and a first polar body. The second maturation division soon occurs in the secondary oocyte, in which the nucleus is divided into a mature egg nucleus (female pronucleus) and second polar body nuclei. The first polar body, in some cases, was successively divided into two polar bodies; in other instances, it was not divided. After the successive maturation division, the egg nucleus and the sister second polar body nucleus drew near to fuse into the zygote nucleus. The chromosome number was doubled in the zygote, and this conjugation initiates subsequent embryonic development. This suggests that, in E. shigae, the process of parthenogenetic recovery of diploidy is the automictic type categorized as the 'terminal fusion' pattern.

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Mechanisms of karyotype evolution in the Brazilian scorpions of the subfamily Centruroidinae (Buthidae)

2018

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The recently-revised subfamily Centruroidinae is part of the New World clade of buthid scorpions. In this study, we analyzed the cytogenetic characteristics of nine of the 10 Brazilian centruroidines, and one undescribed species of the genus Ischnotelson, using a phylogenetic approach to determine the chromosomal rearrangements responsible for the differentiation of karyotypes among the species. The cytogenetic data recorded in the present study supported the new taxonomic arrangement of the Centruroidinae, with all the species of the same genus sharing the same or similar diploid numbers, i.e., 2n = 20 or 22 in Troglorhopalurus lacrau and T. translucidus, 2n = 25 or 26 in Ischnotelson sp., I. guanambiensis and I. peruassu, and 2n = 28 in Jaguajir agamemnon, J. pintoi and J. rochae. The karyotype modelling in the ChromEvol software indicated 2n = 18 as the ancestral diploid number of the Centruroidinae. The differentiation of karyotypes among the centruroidine genera was based on increasing chromosome numbers resulting from progressive fission events. These changes probably occurred prior to the diversification of the genera Ischnotelson, Jaguajir, Physoctonus and Rhopalurus, and appear to have played a more important role in karyotype evolution at the intergeneric level than the interspecific one. However, the observed increase in diploid numbers was not accompanied by changes in the number or location of ribosomal genes or telomeric sequences. The identification of meiotic cells in female specimens also allowed us to discuss the mechanisms of achiasmatic meiosis in scorpions.

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Egg maturation and parthenogenetic recovery of diploidy in the scorpionLiocheles australasiae (Fabricius) (Scorpions, Ischnuridae)

Cited by 7 publications

References 25 publications

Male and female meiosis in the mountain scorpion Zabius fuscus (Scorpiones, Buthidae): heterochromatin, rDNA and TTAGG telomeric repeats

Male and female meiosis in the mountain scorpion Zabius fuscus (Scorpiones, Buthidae): heterochromatin, rDNA and TTAGG telomeric repeats

Automictic parthenogenesis of a geographically parthenogenetic mayfly, Ephoron shigae (Insecta: Ephemeroptera, Polymitarcyidae)

Mechanisms of karyotype evolution in the Brazilian scorpions of the subfamily Centruroidinae (Buthidae)

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