Geometric Perspectives of Sexual Dimorphism in the Wing Shape of Lepidoptera: the Case of Synneuria sp. (Lepidoptera: Geometridae)
Keywords:Geometric morphometric, wing shape, moths, phenotype, sexual shape dimorphism, interpopulation
We investigated the sexual dimorphism in wing shape in Synneuria sp., using the tools of geometric morphometrics. This species, which has taxonomic problems, has a limited geographic distribution. In the spring and summer of 2006-2007 we collected 63 males and 58 females in farms named â€œEl Guindo (36Âº50â€™12â€™â€™W - 73Âº01â€™25â€™â€™S) and Coyanmahuidaâ€ (36Â°49â€™28.66â€S - 72Â°44â€™1.34â€W) in the province of ConcepciÓn, Biobío Region of Chile. We photographed the right wing of each individual and constructed a photographic matrix in which we digitalized 18 morphological landmarks based on the shape and vein pattern of the wing. A multivariate factorial analysis of wing shape showed significant differences between sexes (F = 4.237; p= < 0.05) but not among localities (F = 0.169; p= >0.05), in which the sectorized landmarks indicated large contributions to wing shape in the matrix R``#7: 0.49945 and #8: 0.46818. The geometric variation demonstrated that the points in the bases of the radial veins were key characters to differentiate between sexes.
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