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X-chromosome mapping experiments suggest occurrence of cryptic species in the tsetse fly Glossina palpalis palpalis

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Using flies from colonies of Glossina palpalis palpalis (Robineau-Desvoidy, 1830) (Diptera: Glossinidae) that originated in Nigeria and Bas-Zaire, the two microsatellite loci Gpg19.62 and Gpg55.3 have been added to the X-chromosome map, thus increasing to seven the number of loci mapped on that chromosome. During the mapping and other crossing experiments, sterile F1 and backcross males were found. Similarities between the patterns of sterility found in the present study and those occurring during hybridization of some subspecies of tsetse suggest that the nominal taxon G. p. palpalis may contain cryptic taxa. Differences in the width of the postgonite head of males from the two colonies were consistent with this suggestion.

Dans le but d'améliorer la carte génétique de Glossina palpalis palpalis (Robineau-Desvoidy, 1830) (Diptera : Glossinidae), nous avons étudié deux populations d'insectarium, l'une originaire du Nigéria, l'autre du Bas-Zaïre. Deux loci microsatellites, Gpg19.62 et Gpg55.3 ont pu être localisés sur la carte du chromosome X, qui totalise ainsi sept loci cartographiés. Pendant ces expériences de cartographie et de croisement, des individus stériles ont été trouvés dans la F1 et parmi les mâles issus de rétrocroisements. L'existence de tels individus stériles a déjà été observée dans des croisements entre certaines sous-espèces différentes chez les tsé-tsé, et laissent croire à l'existence possible d'espèces jumelles au sein du taxon G. p. palpalis. Des différences morphologiques portant sur la tête des paramères des mâles des deux colonies confirment les résultats obtenus par croisement.

Document Type: Research Article

Publication date: 2004-12-01

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