Volume 53, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



An electrophoretic survey of 42 populations of collected throughout its known geographic distribution was performed to clarify the taxonomic status of this important malaria vector species. The results indicated strong differences in the allele frequencies of three enzyme loci (glycerol dehydrogenase, 6-phosphogluconate dehydrogenase, and phosphoglucomutase) of the 33 loci analyzed. No fixed electromorphic differences separate the populations of . The populations of showed little genetic divergence, with Nei distances ranging from 0 to 0.079. A comparison of data with either one of three other species showed a high genetic distance of 0.335 with a closely related species, ; 0.997 with , and 2.355 with . Geographic populations of were classified into three clusters; one cluster included populations collected in North America (United States and Mexico) and Guatemala, one cluster included populations from Belize and South America (Colombia, Ecuador, Peru, Chile, and Argentina); and one cluster was represented by populations from the Island of Grenada (type-locality of ). Based on our isozyme analyses, we defined these clusters as three geographic populations of . Of the two mainland populations, one extends from the southern United States south through Mexico and Guatemala, and the other extends north from southern South America through Central America to Belize. These two geographic populations converge in southern Mexico and northern Central America. One part of the convergence zone was identified in the area of eastern Guatemala and southern Belize.


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