Abstract
Two closely related allopatric species in the tryoni complex, Dacus (Bactrocera) aquilonis (May) and D. (Bactrocera) tryoni (Froggatt), are compared on the basis of morphology, cytology, electrophoresis of enzymes, mating and sterility tests, and chemical analyses of male pheromones, and are shown to be valid species. The species were found to be closely related, showing only small morphological differences in body color, male surstyli, ovipositors, and egg surfaces. Differences were found in isoelectric focusing of esterase and glutamate dehydrogenase enzymes. A Nei's similarity coefficient of 0.95 was calculated based on 30 loci in cellulose acetate gel electrophoresis. Small differences were found in minor components of male pheromones, but no differences were found in metaphase chromosomes and asymmetric isolation in mate-recognition and sterility tests. Validity of mate-recognition tests in the laboratory is discussed in view of elimination of components of the specific mate-recognition systems that are known to exist in field populations of Dacinae.
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