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1 April 2016 Allometry of locomotor organs and sexual size dimorphism in the mygalomorph spider Grammostola rosea (Walckenaer, 1837) (Araneae, Theraphosidae)
Bruno Grossi, Claudio Veloso, Andrés Taucare-Ríos, Mauricio Canals
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Abstract

Although sexual size dimorphism is a widely observed phenomenon in nature, the selective forces that led to it are still controversial. Here we study sexual dimorphism in the static allometry of the legs of a large ground spider, Grammostola rosea (Walckenaer, 1837). We found that this species has a moderate sexual size dimorphism and males have longer legs relative to body size than females, similar to other ground spiders. We propose that male mate searching behavior may be a relevant factor in the genesis of this phenomenon. The longer extremities in males with respect to mass than in females would lead to an optimization of the costs associated with locomotion, because males have smaller masses and longer legs than the females both in absolute terms and relative to body mass.

The American Arachnological Society
Bruno Grossi, Claudio Veloso, Andrés Taucare-Ríos, and Mauricio Canals "Allometry of locomotor organs and sexual size dimorphism in the mygalomorph spider Grammostola rosea (Walckenaer, 1837) (Araneae, Theraphosidae)," The Journal of Arachnology 44(1), 99-102, (1 April 2016). https://doi.org/10.1636/M15-51.1
Received: 13 July 2015; Published: 1 April 2016
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