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Extreme degree of chromosome number variability in species of the spider genus Scytodes (Araneae, Haplogynae, Scytodidae)

2008; Wiley; Volume: 46; Issue: 2 Linguagem: Inglês

10.1111/j.1439-0469.2007.00457.x

1439-0469

Douglas Araújo, Cristina Anne Rheims, Antônio D. Brescovit, Doralice Maria Cella,

Genomics and Phylogenetic Studies

Journal of Zoological Systematics and Evolutionary ResearchVolume 46, Issue 2 p. 89-95 Extreme degree of chromosome number variability in species of the spider genus Scytodes (Araneae, Haplogynae, Scytodidae) Grado de variabilidad extrema en el número de cromosomas en especies de arañas del género Scytodes (Araneae, Haplogynae, Scytodidae) D. Araujo, D. Araujo Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista – UNESP, Rio Claro, SP, BrazilSearch for more papers by this authorC. A. Rheims, C. A. Rheims Laboratório de Artrópodes, Instituto Butantan, São Paulo, SP, BrazilSearch for more papers by this authorA. D. Brescovit, A. D. Brescovit Laboratório de Artrópodes, Instituto Butantan, São Paulo, SP, BrazilSearch for more papers by this authorD. M. Cella, D. M. Cella Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista – UNESP, Rio Claro, SP, BrazilSearch for more papers by this author D. Araujo, D. Araujo Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista – UNESP, Rio Claro, SP, BrazilSearch for more papers by this authorC. A. Rheims, C. A. Rheims Laboratório de Artrópodes, Instituto Butantan, São Paulo, SP, BrazilSearch for more papers by this authorA. D. Brescovit, A. D. Brescovit Laboratório de Artrópodes, Instituto Butantan, São Paulo, SP, BrazilSearch for more papers by this authorD. M. Cella, D. M. Cella Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista – UNESP, Rio Claro, SP, BrazilSearch for more papers by this author First published: 10 April 2008 https://doi.org/10.1111/j.1439-0469.2007.00457.xCitations: 27 Authors' addresses: Douglas Araujo (for correspondence) and Doralice Maria Cella, Universidade Estadual Paulista - UNESP, Instituto de Biociências, Departamento de Biologia, Av. 24-A, 1515, CEP: 13506-900, Bela Vista, Rio Claro, SP, Brazil. E-mails: [email protected], [email protected]; Cristina Anne Rheims and Antonio Domingos Brescovit, Instituto Butantan, Laboratório de Artrópodes, Av. Vital Brasil, 1500, CEP: 05530-900, São Paulo, SP, Brazil. E-mails: [email protected], [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstracten Genus Scytodes includes most species of the spider family Scytodidae. Until now, 187 species of the genus have been described. In spite of this great diversity, only three Scytodes species were karyotyped so far. The present paper provides for the first time karyotype analysis of two synanthropic species, Scytodes fusca and Scytodes itapevi. Furthermore, new data on karyotype of Scytodes globula are also provided using conventional and differential cytogenetical procedures. The diploid number in the genus Scytodes varied considerably, namely from 2n = 13 to 2n = 31. The diploid number found in S. globula (2n♂ = 13) is the lowest in haplogyne spiders with monocentric chromosomes. Except S. globula, this number has been found only in one haplogyne spider with monocentric chromosomes, namely Ochyrocera sp. (Ochyroceratidae). On the contrary, the diploid number of S. fusca (2n♂ = 31) is one of the highest diploid numbers recorded in haplogyne spiders. The degree of intrageneric variation found in the genus Scytodes is the highest recorded in araneomorph spiders with monocentric chromosomes so far. Some karyotype characteristics (diploid number, chromosome morphology, total chromosome length, and distribution of constitutive heterochromatin) allowed us to postulate a close relationship between S. globula and S. itapevi. According to the karyotype data, S. fusca is not closely related to these two species. This conclusion corroborates a recent taxonomic work that grouped S. globula, S. itapevi, and other four Scytodes species in the 'globula group'. Resumenes El género Scytodes pertencence a la familia de las arañas Scytodidae. Han sido descritas 187 especies del género. Dentro de esta diversidad, solamente tres especies de Scytodes fueron cariotipadas. El presente artículo describe el análisis del cariotipo de dos especies sinantrópicas, Scytodes fusca y Scytodes itapevi. Además, nuevos datos del cariotipo de Scytodes globula también fueron descritos por métodos convencionales y diferenciales. El número diplóide en el género Scytodes varia considerablemente, desde 2n = 13 a 2n = 31. El número diplóide encontrado en S. globula (2n♂ = 13) es el menor en arañas haploginas con cromosomas monocéntricos. Con excepción de S. globula, este número fue encontrado solamente en una araña haplogina con cromosomas monocéntricos, denominada Ochyrocera sp. (Ochyroceratidae). Por otro lado, el número diplóide de S. fusca (2n♂ = 31) es uno de los mayores números diplóides descritos en arañas haploginas. El nivel de variación intragenética encontrada en el género Scytodes es el mayor registrado en arañas araneomorfas con cromosomas monocéntricos. Algunas características de cariotipo (número diplóide, morfología cromosómica, longitud total cromosómica, y distribución de heterocromatina constitutiva) nos permite postular una relación cercana entre S. globula y S. itapevi. De acuerdo con los datos de cariotipo, S. fusca no tiene una relación cercana a estas dos especies. 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Citing Literature Volume46, Issue2May 2008Pages 89-95 ReferencesRelatedInformation