Conventional and ultrastructural analyses of the chromosomes of Discocyrtus pectinifemur (Opiliones, Laniatores, Gonyleptidae)

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorSchneider, M. C.
dc.creatorZacaro, A. A.
dc.creatorOliveira, R. M.
dc.creatorGnaspini, P.
dc.creatorCella, D. M.
dc.date2014-05-20T13:55:30Z
dc.date2016-10-25T17:05:13Z
dc.date2014-05-20T13:55:30Z
dc.date2016-10-25T17:05:13Z
dc.date2009-05-01
dc.date.accessioned2017-04-05T21:13:12Z
dc.date.available2017-04-05T21:13:12Z
dc.identifierJournal of Zoological Systematics and Evolutionary Research. Malden: Wiley-blackwell Publishing, Inc, v. 47, n. 2, p. 203-207, 2009.
dc.identifier0947-5745
dc.identifierhttp://hdl.handle.net/11449/19864
dc.identifierhttp://acervodigital.unesp.br/handle/11449/19864
dc.identifier10.1111/j.1439-0469.2008.00490.x
dc.identifierWOS:000266549500011
dc.identifierhttp://dx.doi.org/10.1111/j.1439-0469.2008.00490.x
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/865649
dc.descriptionAmong the Opiliones, species of the suborders Cyphophthalmi, Eupnoi, Dyspnoi and Laniatores have shown very diverse diploid chromosome numbers. However, only certain Eupnoi species exhibit XY/XX and ZZ/ZW sex chromosome systems. Considering the scarcity of karyotypical information and the absence of structurally identifiable sex chromosomes in the suborder Laniatores, we decided to analyse the chromosomes and bivalents of Discocyrtus pectinifemur (Gonyleptidae) to identify possible sex differences. Testicular cells examined under light microscopy showed it high diploid number, 2n = 88, meta/submetacentric chromosome morphology and a nucleolar organizer region on pair 35. Prophase I microspreading observed in transmission electron microscopy exhibited 44 synaptonemal complexes with similar electron density and thickness. The total and regular synapsis between the chromosomes of the bivalents was also noted in pachytene nuclei. Male mitotic and meiotic chromosomes revealed no distinct characteristic that could be related to the occurrence of heteromorphic sex chromosomes. Evolutionary trends of chromosome differentiation in the four suborders of Opiliones are discussed here.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherWiley-Blackwell Publishing, Inc
dc.relationJournal of Zoological Systematics and Evolutionary Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectchromosomal differentiation
dc.subjectkaryotype
dc.subjectmeiosis
dc.subjectnucleolar organizer
dc.subjectsynaptonemal complex
dc.titleConventional and ultrastructural analyses of the chromosomes of Discocyrtus pectinifemur (Opiliones, Laniatores, Gonyleptidae)
dc.typeOtro


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