Comparative Cytogenetics of Seven Ctenidae Species (Araneae)
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Data
2014-02-01
Autores
Araujo, Douglas
Oliveira, Edson Gabriel de [UNESP]
Giroti, Andre Marsola
Mattos, Viviane Fagundes [UNESP]
Paula-Neto, Emygdio [UNESP]
Brescovit, Antonio Domingos
Schneider, Marielle Cristina
Cella, Doralice Maria [UNESP]
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Zoological Soc Japan
Resumo
The present study elevates the number of cytogenetically analyzed ctenid species and genera from two to eight and six, respectively, presenting comparisons between chromosomal data obtained and the phylogenetic hypothesis proposed in the literature. Six ctenid species presented 13 autosomal pairs, exhibiting either X(1)X(2)0 (Ctenus ornatus, Ctenus sp., Parabatinga brevipes and Phoneutria nigriventer) or X(1)X(2)X(3)0 sex chromosome systems (Nothroctenus sp. and Viracucha andicola). Asthenoctenus borellii showed 2n male = 20 + X(1)X(2)0. In all species, the chromosomes were telocentric. Some cells of one C. ornatus specimen exhibited one extra chromosome that, considering the behavioral similarities between the two chromosomes, can be considered to be supernumerary, derived from or giving rise to a sex chromosome. Silver impregnation revealed nucleolar organizer regions on one autosomal pair of C. ornatus and P. nigriventer (Cteninae) and two pairs of V. andicola (Acanthocteninae). Chromosomal data suggests that the X(1)X(2)X(3)0 system arose several times in the evolution of entelegyne spiders, and that conversion of an X(1)X(2)0 system into an X(1)X(2)X(3)0 system and vice-versa has been a relatively common event in spiders. All the chromosomal data corroborate the close relationship between Ctenus and Phoneutria, the placement of P. brevipes within Cteninae, the placement of Anahita in a separated branch within Cteninae, and the inclusion of A. borellii in a distinct group within the ctenids (Viridasiinae), all of which are as proposed by phylogenetic hypotheses available in the literature.
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Palavras-chave
diploid number, karyotype, meiosis, nucleolar organizer region, sex chromosome system, GST clade, Cteninae, Acanthocteninae, Viridasiinae
Como citar
Zoological Science. Tokyo: Zoological Soc Japan, v. 31, n. 2, p. 83-88, 2014.