Chromosomal study on selected small araneomorph spiders from Brazil, including the first records in Palpimanidae and Theridiosomatidae (Araneae, Araneomorphae)

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dc.contributorLab. Coleções Zoológicaspt_BR
dc.contributor.authorDutra, Débora Duartept_BR
dc.contributor.authorBrescovit, Antonio Domingospt_BR
dc.contributor.authorAraujo, Douglaspt_BR
dc.identifier.citationDutra DD, Brescovit AD, Araujo D. Chromosomal study on selected small araneomorph spiders from Brazil, including the first records in Palpimanidae and Theridiosomatidae (Araneae, Araneomorphae). Zool Stud. 2023 Aug; 62:42. doi:10.6620/ZS.2023.62-42.pt_BR
dc.description.abstractAmong the 50,474 spider species, only 849 have chromosomal data available in the literature. Fifty spider families remain unknown from a cytogenetic perspective. The aim of this study was to analyze chromosomally selected araneomorph spiders from Brazil, to contribute to the cytotaxonomy and chromosome evolution of this group. The karyotypes of 12 species belonging to families Corinnidae, Linyphiidae, Oonopidae, Palpimanidae, Theridiidae, Theridiosomatidae, Trachelidae, and Zodariidae were analyzed, including the first chromosomal record for the first two families. Specimens (with the abdomen content partially exposed by perforation) were subjected to colchicine, hypotonization, and fixation. In most cases, the total content of the abdomen was used to prepare slides by spreading of cell suspension and subsequent Giemsa staining. The results were as follows: Cinetomorpha simplex Simon, 1892 (Oonopidae) 2n♂ = 9, X0; Neotrops sp. and Neoxyphinus termitophilus (Oonopidae), 2n♂ = 7, X0; Otiothops birabeni (Palpimanidae); Agyneta sp. (Linyphiidae), 2n♂ = 24, X1X20; Coleosoma floridanum, Thymoites sp.1 and Thymoites sp.2 (Theridiidae), 2n♂ = 22, X1X20; Naatlo sp. (Theridiosomatidae), 2n♂ = 30, X1X20; Orthobula sp. (Trachelidae) 2n♂ = 21, X0; Falconina sp. (Corinnidae), 2n♂ = 28, X1X20; Epicratinus sp. (Zodariidae) 2n♂ = 42, X1X20. The chromosomal morphology was determined for all the samples except for Oonopidae. Most species exhibited telocentric chromosomes, with the exception of Palpimanidae and Theridiosomatidae. The main findings: 1) support an hypothesis on ancestral karyotype of Zodariidae and Oonopidae; 2) reveal a relatively high chromosome number in Palpimanidae that supports an idea on relatively high ancestral chromosome number (2n♂ = 42) of entelegyne spiders (Palpimanoidea is sister group of entelegyne spiders); 3) show that the karyotype found in Theridiosomatidae is exceptional within the Araneoidea.pt_BR
dc.description.sponsorship(CAPES) Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.relation.ispartofZoological Studiespt_BR
dc.rightsRestricted accesspt_BR
dc.titleChromosomal study on selected small araneomorph spiders from Brazil, including the first records in Palpimanidae and Theridiosomatidae (Araneae, Araneomorphae)pt_BR
dc.contributor.external(UFMS) Universidade Federal de Mato Grosso do Sulpt_BR
dc.subject.keywordDiploid numberpt_BR
dc.subject.keywordSex chromosome systempt_BR
dc.relation.ispartofabbreviatedZool Studpt_BR
dc.identifier.citationabntv. 62, 42, ago. 2023pt_BR
dc.identifier.citationvancouver2023 Aug; 62:42pt_BR
dc.contributor.butantanBrescovit, Antonio Domingos|:Pesquisador|:Lab. Coleções Zoológicaspt_BR
dc.sponsorship.butantan(CAPES) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior¦¦001pt_BR
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