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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/28321
Title: 
On the development of the brown spider Loxosceles gaucho Gertsch (Araneae, Sicariidae): the nympho-imaginal period
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
0101-8175
Sponsorship: 
Fundação para o Desenvolvimento da UNESP (FUNDUNESP)
Abstract: 
Observations of the developmental biology of Loxosceles gaucho Gertsch, 1967, the brown spider of southeastern Brazil are scarce. The present study reports the method of individualized rearing of 18 populations of L. gaucho, kept in laboratory under varied diet conditions, and characterizes their nympho-imaginal period as well as factors related to their reproduction. Females built the first egg sac about 20 days after copulation and nymphs hatched 40 days after the laying date. Average offspring was 61.3 spiderlings and females usually built three to four successive egg sacs in a period of five to seven months. First nymphs initiated their predatory activity between the 5th and 8th days after hatching and the majority reached adulthood within six moults (range of five to eight) in approximately 15 to 17 months (male) and 15.5 to 18 months (female). The average sex ratio equaled 1.0:1.7 (male:female). The wide individual variability of this species intermoult intervals is herewith expressed by the intermoult rate, which was fairly uniform for both intra and interpopulations and gives a relevant aspect for a general idea of the life cycles of spiders.
Issue Date: 
1-Sep-1997
Citation: 
Revista Brasileira de Zoologia. Sociedade Brasileira de Zoologia, v. 14, n. 3, p. 697-706, 1997.
Time Duration: 
697-706
Publisher: 
Sociedade Brasileira de Zoologia
Keywords: 
  • Brown spider
  • Loxosceles gaucho
  • Sicariidae
  • development
Source: 
http://dx.doi.org/10.1590/S0101-81751997000300018
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/28321
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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