Revista Brasileira de Entomologia Revista Brasileira de Entomologia
Rev Bras Entomol 2017;61:365-9 - Vol. 61 Num.4 DOI: 10.1016/j.rbe.2017.06.003
Systematics, Morphology and Biogeography
Sexual dimorphism and population differentiation in the Chilean Neotropical moth Macaria mirthae (Lepidoptera, Geometridae): a wing geometric morphometric example
Hugo A. Beníteza,b,, , Héctor A. Vargasa
a Universidad de Tarapacá, Facultad de Ciencias Agronómicas, Departamento de Recursos Ambientales, Arica, Chile
b Cambridge University, Museum of Zoology, Cambridge, United Kingdom
Received 16 April 2017, Accepted 20 June 2017
Abstract

Sexual shape dimorphism is the differentiation of male and female organisms based on their shape variation; this definition was proposed for the use of geometric morphometrics analysis where the geometric features of the shape are analyzed without the influence of the size. Macaria mirthae (Lepidoptera: Geometridae) is a moth that inhabits different valleys in the north of Chile principally associated to Acacia macracantha and lately Leucaena leucocephala both trees of the Fabaceae family. The Sexual dimorphism was analyzed in this species in order to corroborate studies on the use of wing as a sexual differentiation trait, and specific influence of localities was also evaluated. A clear shape variation was found where the male wings are more contracted compared to female wings. A climate influence is also suggested that could differentiate the wing shape from the individuals that inhabit two different valleys in the neotropical region of the north of Chile. This research supports previous studies identifying a clear Sexual shape dimorphism in the wing, as a selected trait, suggesting that oviposition and male competition of this group of moths is reflected in their wings. These differences raise the question whether Sexual shape dimorphism can be modulated by natural selection.

Keywords
Wing shape, Sexual dimorphism, Geometridae, Azapa valley, Chaca valley
Rev Bras Entomol 2017;61:365-9 - Vol. 61 Num.4 DOI: 10.1016/j.rbe.2017.06.003