Karyotypes and meiotic mechanisms of some eumastacid grasshoppers from East Africa, Madagascar, India and South America

White, M. J. D.

doi:10.1007/bf00293910

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…It is now clear that the genus Birodlo exhibits a considerable diversity of karyotypes. This, in itself, is a point of resemblance to the Morabinae and a point of difference from the eumastacid subfamilies Thericleinae and Pseudoschmidtiinae (White 1965(White , 1968(White , 1970, where the individual genera show much more karyotype uniformity, at least at the relatively superficial level of chromosome arms and their lengths (cryptic karyotypic differences, which could be revealed by modern Giemsa banding techniques, for example, may be extensive). At least 3 fusions or dissociations must be postulated to explain the differences in chromosome number between Biroella sp.…”

Section: Discussionmentioning

confidence: 99%

Karyotypes in the Genus Biroella and the Origin of the Australian Morabine Grasshoppers*

White

1975

Australian Journal of Entomology

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Although one species or Bir.oc//~i (Orthoptcra. Eumastacidae, Biroellinae) from the Cape Y o r k Peninsula has ii 2ti,3 = 17 liaryotype.which rcscmhles that of many species of Morabinae, two other species ofBir.oc,//tr froin Pcipun. with 2 n d = I S and 2n.2 = I I. have karyotypes that show no particular similarity to ;my morahine. The diversity of karyotypes in the genus Biroc,//ti seems to be extreme. even by comparison with thc Morabinae. IntroductionThe endemic subfamily Morabinae, with over 250 species, is an extremely characteristic element in the Australian orthopteran fauna. The karyotypes of approximately 200 species are now; known (White 1974, Webb andWhite 1975). Although a great many structural rearrangements have occurred, it seems possible to recognize a primitive karyotype consisting of2116 = 17 (XO), hi, = 18 (XX). there being 2 large pairs of metacentric aiitosonies (an equal-armed 'AB' chromosonie and a somewhat small unequal-armed 'CD' chromosome) and 6 pairs of small autosomes which are mostly acrocentric, but include one or more pairs of metacentrics.

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Section: Discussionmentioning

confidence: 99%

Karyotypes in the Genus Biroella and the Origin of the Australian Morabine Grasshoppers*

White

1975

Australian Journal of Entomology

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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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Modes of speciation in orthopteroid insects

White

1980

Bolletino di zoologia

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Karyotypes and meiotic mechanisms of some eumastacid grasshoppers from East Africa, Madagascar, India and South America

Cited by 4 publications

References 15 publications

Karyotypes in the Genus Biroella and the Origin of the Australian Morabine Grasshoppers*

Karyotypes in the Genus Biroella and the Origin of the Australian Morabine Grasshoppers*

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

Modes of speciation in orthopteroid insects

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