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ELECTROPHORETIC AND MORPHOLOGICAL SEPARATION OF PROSIMULIUM FUSCUM AND P. MIXTUM LARVAE (DIPTERA: SIMULIIDAE)

  • T. P. Snyder (a1) and M. C. Linton (a1)

Abstract

Prosimulium fuscum and P. mixtum larvae and adults may be readily separated on the basis of unique complements of electromorphs at the 6-phosphogluconate dehydrogenase locus. The species are closely related and share common electromorphs at 10 other polymorphic and monomorphic loci. Numerical analysis of 24 morphological characters from larvae shows cephalic fan ray number and the length of the postgenal bridge plus hypostomium can be used to identify most individuals to species. A possible environmental component in determination of morphotype may prevent correct identification of all larvae. Lack of utility of other characters currently used in keys to separate the species is discussed.

Les larves et adultes des Prosimulium fuscum et P. mixtum peuvent être distingués sans difficulté à partir de leurs profiles uniques d'électromorphes au locus de la 6-phosphogluconate déhydrogénase. Les espèces sont étroitement apparentées, partageant des électromorphes communes à 10 autres loci polymorphiques ou monomorphiques. L'analyse numérique de 24 caractères morphologiques larvaires a montré que le nombre de soies de l'éventail céphalique et la longueur du pont postgénal plus hypostomium peuvent permettre l'identification à l'espèce de la plupart des individus. Un élément environnemental possiblement impliqué dans la détermination du morphotype pourrait empêcher l'identification correcte de toutes les larves. On discute du peu d'utilité des autres caractères utilisés couramment dans les clés pour la séparation des espèces.

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ELECTROPHORETIC AND MORPHOLOGICAL SEPARATION OF PROSIMULIUM FUSCUM AND P. MIXTUM LARVAE (DIPTERA: SIMULIIDAE)

  • T. P. Snyder (a1) and M. C. Linton (a1)

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