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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Chromosomal similarities between Nephilidae and Tetragnathidae indicate unique evolutionary traits among Araneoidea

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Author(s):
Araujo, D. [1] ; Paula-Neto, E. [2] ; Brescovit, A. D. [3] ; Cella, D. M. ; Schneider, M. C. [4]
Total Authors: 5
Affiliation:
[1] Univ Fed Mato Grosso do Sul, UFMS, Setor Biol Geral, Ctr Ciencias Biol & Saude, BR-79070900 Campo Grande, MS - Brazil
[2] Univ Estadual Paulista, Inst Biociencias, Dept Biol, UNESP, Rio Claro - Brazil
[3] Inst Butantan, Lab Especial Colecoes Zool, Sao Paulo - Brazil
[4] Univ Fed Sao Paulo, UNIFESP, Dept Ciencias Biol, Diadema - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ITALIAN JOURNAL OF ZOOLOGY; v. 82, n. 4, p. 513-520, OCT 2 2015.
Web of Science Citations: 1
Abstract

Nephilid systematics has been subject to several changes in the last years, and the use of non-classical characters could be useful for evolutionary considerations. In this study, we analyzed the mitotic chromosomes of two nephilid spiders, Nephila clavipes and Nephila sexpunctata, using standard staining, silver nitrate impregnation and C-banding techniques, aiming to discuss the chromosomal similarities of Nephilidae and Tetragnathidae, and chromosome evolution within Nephila and Nephilingis. The basic karyotype characteristics observed in these two species (2no=22+X(1)X(2)0 and monoarmed chromosomes) were similar to those registered for most araneoid families, i.e., Araneidae, Linyphiidae, Nephilidae, Nesticidae and Tetragnathidae. However, the occurrence of both prominent secondary constrictions and nucleolar organizer regions (NORs) is a shared characteristic between Nephilidae and Tetragnathidae, considering that these regions were not observed in any other Araneoidea species cytogenetically examined. Furthermore, in the present study we showed that within Nephila and Nephilingis species, change in the number and location of NORs as well as in the quantity and distribution of constitutive heterochromatin were the main events responsible for chromosome evolution, and that these differences can be useful in the cytotaxonomy of this group. (AU)

FAPESP's process: 11/21643-1 - Meiosis in scorpions (Arachnida): model to understand the evolution in species with achiasmate chromosomes
Grantee:Marielle Cristina Schneider
Support Opportunities: Research Grants - Young Investigators Grants