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Wing shape as a potential discriminator of morphologically similar pest taxa within theBactrocera dorsalis species complex (Diptera: Tephritidae)

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Schutze, M. K., Jessup, A. and Clarke, A.R. (2012) Wing shape as a potential discriminator of morphologically similar pest taxa within theBactrocera dorsalis species complex (Diptera: Tephritidae). Bulletin of Entomological Research, 102 (1). pp. 103-111. ISSN 0007-4853


Article Link: http://dx.doi.org/10.1017/S0007485311000423


Four morphologically cryptic species of the Bactrocera dorsalis fruit fly complex (B. dorsalis s.s., B. papayae, B. carambolae and B. philippinensis) are serious agricultural pests. As they are difficult to diagnose using traditional taxonomic techniques, we examined the potential for geometric morphometric analysis of wing size and shape to discriminate between them. Fifteen wing landmarks generated size and shape data for 245 specimens for subsequent comparisons among three geographically distinct samples of each species. Intraspecific wing size was significantly different within samples of B. carambolae and B. dorsalis s.s. but not within samples of B. papayae or B. philippinensis. Although B. papayae had the smallest wings (average centroid size=6.002 mm±0.061 SE) and B. dorsalis s.s. the largest (6.349 mm±0.066 SE), interspecific wing size comparisons were generally non-informative and incapable of discriminating species. Contrary to the wing size data, canonical variate analysis based on wing shape data discriminated all species with a relatively high degree of accuracy; individuals were correctly reassigned to their respective species on average 93.27% of the time. A single sample group of B. carambolae from locality ‘TN Malaysia’ was the only sample to be considerably different from its conspecific groups with regards to both wing size and wing shape. This sample was subsequently deemed to have been originally misidentified and likely represents an undescribed species. We demonstrate that geometric morphometric techniques analysing wing shape represent a promising approach for discriminating between morphologically cryptic taxa of the B. dorsalis species complex.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Business groups:Biosecurity Queensland
Keywords:canonical variate analysis, cryptic species, fruit flies, generalised Procrustes analysis, interspecific variation, intraspecific variation
Subjects:Science > Entomology
Plant pests and diseases
Plant pests and diseases > Economic entomology
Live Archive:02 Jul 2024 01:38
Last Modified:02 Jul 2024 01:40

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