Bulletin of Entomological Research

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Bulletin of Entomological Research (2010), 100:19-26 Cambridge University Press
Copyright © 2009 Cambridge University Press
doi:10.1017/S0007485309006762

Research Paper

Wing morphometry as a tool for correct identification of primary and secondary New World screwworm fly


M.L. Lyraa1a2 c1, L.M. Hatadania2, A.M.L. de Azeredo-Espina1a2 and L.B. Klaczkoa2

a1 Laboratório de Genética Animal, Centro de Biologia Molecular e Engenharia Genética e Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
a2 Departamento de Genética e Evolução, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
Article author query
lyra ml [PubMed]  [Google Scholar]
hatadani lm [PubMed]  [Google Scholar]
de azeredo-espin aml [PubMed]  [Google Scholar]
klaczko lb [PubMed]  [Google Scholar]

Abstract

Cochliomyia hominivorax and Cochliomyia macellaria are endemic Neotropical Calliphoridae species. The former causes severe myiasis in hosts while the latter is Sarcosaprophagous, but commonly found as a second invader in wounds. Due to the morphological similarity between them and the potential losses that C. hominivorax represents for cattle breeders, the rapid and correct identification of these two species is very important. In addition to a correct identification of these species, a good knowledge of C. hominivorax biology can be helpful for designing control programs. We applied geometric morphometric methods to assess wing differences between C. hominivorax and C. macellaria and conduct a preliminary analysis of wing morphological variation in C. hominivorax populations. Canonical variate analysis, using wing shape data, correctly classified 100% of the individuals analyzed according to sex and species. This result demonstrates that wing morphometry is a simple and reliable method for identifying C. hominivorax and C. macellaria samples and can be used to monitor C. hominivorax. Both species show sexual dimorphism, but in C. hominivorax it is magnified. We suggest that this may reflect different histories of selection pressures operating on males and females. Significant differences in wing size and shape were obtained among C. hominivorax populations, with little correlation with latitude. This result suggests that wing variation is also a good morphological marker for studying population variation in C. hominivorax.

(Accepted December 18 2008)

(Online publication March 23 2009)

Key Words:Cochliomyia sp.; species identification; wing morphometry; sexual dimorphism; populations

Correspondence:

c1 Author for correspondence Fax: 55-19-3521 10 89 E-mail: marillyra@gmail.com