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

Autor(es)

Ubinski, Crislaine Vanessa ^[1] ; Carvalho, Leonardo Sousa ^[2] ; Schneider, Marielle Cristina ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, UNIFESP, Dept Ecol & Biol Evolut, Av Prof Artur Riedel 275, BR-09972270 Diadema, SP - Brazil

^[2] Univ Fed Piaui, UFPI, Campus Amilcar Ferreira Sobral, BR 343, Km 3-5, BR-64800000 Floriano, Piaui - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Genetica; v. 146, n. 6, p. 475-486, DEC 2018.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 11/21643-1 - Meiose em escorpiões (Arachnida): modelo para compreender a evolução em espécies com cromossomos aquiasmáticos
• Beneficiário: Marielle Cristina Schneider
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores