Contributions to the Cytology of Indian Scorpions. Chromosomal Behaviour in the Male Meiosis of<i>Palamnaeus Gravimanus</i>

Venkatanarasimhaiah, C. B.; Rajasekarasetty, M. R.

doi:10.1080/00087114.1964.10796124

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…Achiasmatic meiosis has originated independently in various groups all over the animal kingdom (except for mammals) and in some plants (W hite 1973). Among arachnids, this mode of meiosis has been revealed in the majority of scorpions studied to date ( de T oledo 1941, V enkatanarasimhaiah 1965, S hanahan and H ayman 1990), some acariform mites (K eyl 1957), and spiders of the families Dysderidae and Segestriidae (B enavente and W ettstein 1980, R odríguez G il et al 2002). Except for some scorpions, all of these groups exhibit holokinetic (holocentric) chromosomes ( de T oledo 1941, O liver 1977, B enavente and W ettstein 1980), while chthoniid pseudoscorpions possess normal (i.e.…”

Section: Discussionmentioning

confidence: 97%

Karyotype analysis and achiasmatic meiosis in pseudoscorpions of the family Chthoniidae (Arachnida: Pseudoscorpiones)

Šťáhlavský

Král

2004

Hereditas

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Karyotypes of pseudoscorpions (Arachnida, Pseudoscorpiones) are largely unknown. Here we describe for the first time karyotypes of the suborder Epiocheirata, represented by 9 European species of two genera of Chthoniidae, Chthonius and Mundochthonius. Diploid chromosome numbers of males range from 21 to 37. Karyotypes of both genera differ substantially. Acrocentric chromosomes predominate in karyotypes of the genus Chthonius, whereas M. styriacus exhibits a predominance of metacentric chromosomes. These differences suggest that the two genera belong probably to distant branches of the family Chthoniidae. It is proposed that karyotype evolution of the genus Chthonius was characterised by a reduction of chromosome numbers by tandem and centric fusions as well as gradual conversion of acrocentric chromosomes to biarmed ones, mostly by pericentric inversions. A tendency towards reduced chromosome numbers is evident in the subgenus Ephippiochthonius. All species display X0 sex chromosome system that is probably ancestral in pseudoscorpions. The X chromosome exhibits conservative morphology. It is metacentric in all species examined, and in the majority of them, a subterminal secondary constriction was found at one of its arms. In contrast to chthoniids, secondary constriction was not reported on sex chromosomes of other pseudoscorpions. Analysis of prophase I chromosomes in males revealed an achiasmatic mode of meiosis. Findings of the achiasmatic meiosis in both genera, Chthonius and Mundochthonius, indicate that this mode of meiosis might be characteristic of the family Chthoniidae. Amongst arachnids, achiasmatic meiosis has only been described in some scorpions, acariform mites, and spiders.

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Section: Discussionmentioning

confidence: 97%

Karyotype analysis and achiasmatic meiosis in pseudoscorpions of the family Chthoniidae (Arachnida: Pseudoscorpiones)

Šťáhlavský

Král

2004

Hereditas

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“…Sharma etal (1959) have also reported the occurrence of translocation heterozygosity in two species of Indian Buthid scorpions. Venkatanarasimhaiah and Rajasekarasetty (1964) have not reported the oGct~rrence of chromosomal interchanges in Palamnaeus gravimanus.…”

Section: Discussionmentioning

confidence: 98%

Chromosome biology of the scorpionPalamnaeus sp

Rajasekarasetty

Aswathanarayana

Kumaraswamy

1979

Proc. Indian Acad. Sci.

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The chromosomes of the male scorpion Palamnaeus sp. has been analysed making use of the Colehicine-hypotonic-suspension technique. The diploid number has been found to be 62. The presence of clear constriGtions on the spermatogonial metaphase chromosomes is noticed. The occurrence of diplo. tene-diakinesis, chiasmata and translocations have been encountered. The nature of the kinetochore is discussed. It is opined that the chromosomes of this scorpion are apparently monoeentric (represented by constrictions on chromosomes) but behaving as holo~entrie.

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

et al. 2000

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Contributions to the Cytology of Indian Scorpions. Chromosomal Behaviour in the Male Meiosis ofPalamnaeus Gravimanus

Cited by 7 publications

References 15 publications

Karyotype analysis and achiasmatic meiosis in pseudoscorpions of the family Chthoniidae (Arachnida: Pseudoscorpiones)

Karyotype analysis and achiasmatic meiosis in pseudoscorpions of the family Chthoniidae (Arachnida: Pseudoscorpiones)

Chromosome biology of the scorpionPalamnaeus sp

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

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