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Journal of Heredity Advance Access originally published online on December 7, 2006
Journal of Heredity 2007 98(1):51-59; doi:10.1093/jhered/esl037
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Published by Oxford University Press 2006.

Intragenomic rDNA ITS2 Variation in the Neotropical Anopheles (Nyssorhynchus) albitarsis Complex (Diptera: Culicidae)

Cong Li, and Richard C. Wilkerson

From the Department of Entomology, Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD 20910-7500

Address correspondence to Dr. R. C. Wilkerson, Smithsonian Institution, Museum Support Center, 4210 Silver Hill Road, Suitland, MD 20746, or e-mail: wilkersonr{at}si.edu.

We cloned and sequenced the rDNA internal transcribed spacer 2 (ITS2) of 4 species belonging to the neotropical Anopheles (Nyssorhynchus) albitarsis complex, that is, A. albitarsis; A. albitarsis B; Anopheles marajoara, a proven malaria vector; and Anopheles deaneorum, a suspected vector. Even though the ITS2 sequences of these species were very similar (≤1.17% divergence), we found differences suitable for species identification and intragenomic variation of possible consequence in phylogenetic reconstruction. Variation came from 2 microsatellite regions and a number of indels and base substitutions. The existence of partially correlated subsets of clones in A. albitarsis is hypothesized either to be separate rDNA loci or to be semi-independently evolving portions of a single rDNA locus. No differences were found between males and females, suggesting that similar rDNA arrays exist on both the X and Y chromosomes. In addition, highly variant clones, possibly pseudogenes, were found in A. marajoara from Venezuela.


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