What is sympatric speciation in parasites?

mitochondria and hydrogenosomes. Proc. Natl. Acad. Sci. U. S. A. 93, 9651–9656 12 Roger, A.J. et al. (1998) A mitochondrial-like chaperonin 60 gene in Giardia lamblia: evidence that diplomonads once harbored an endosymbiont related to the progenitor of mitochondria. Proc. Natl. Acad. Sci. U. S. A. 95, 229–234 13 Muller, M. (1993) The hydrogenosome. J. Gen. Microbiol. 139, 2879–2889 14 Dyall, S.D. and Johnson, P.J. (2000) Origins of hydrogenosomes and mitochondria: evolution and organelle biogenesis. Curr. Opin. Microbiol. 3, 404–411 15 Mai, Z. et al. (1999) Hsp60 is targeted to a cryptic mitochondrionderived organelle (‘crypton’) in the microaerophilic protozoan parasite Entamoeba histolytica. Mol. Cell. Biol. 19, 2198–2205 16 Tovar, J. et al. (1999) The mitosome, a novel organelle related to mitochondria in the amitochondrial parasite Entamoeba histolytica. Mol. Microbiol. 32, 1013–1021 17 Tovar, J. et al. (2003) Mitochondrial remnant organelles of Giardia function in iron–sulphur protein maturation. Nature 426, 172–176 18 Upcroft, P. and Upcroft, J.A. (2001) Drug targets and mechanisms of resistance in the anaerobic protozoa. Clin. Microbiol. Rev. 14, 150–164 19 Sobel, J.D. et al. (1999) Metronidazole-resistant vaginal trichomoniasis – an emerging problem. N. Engl. J. Med. 341, 292–293 20 Dunne, R.L. et al. (2003) Drug resistance in the sexually transmitted protozoan Trichomonas vaginalis. Cell Res. 13, 239–249 21 Bowden, F.J. and Garnett, G.P. (1999) Why is Trichomonas vaginalis ignored? Sex. Transm. Infect. 75, 372–374 22 Wang, A.L. and Wang, C.C. (1985) Isolation and characterization of DNA from Tritrichomonas foetus and Trichomonas vaginalis. Mol. Biochem. Parasitol. 14, 323–335 23 Lehker, M.W. and Alderete, J.F. (1999) Resolution of six chromosomes of Trichomonas vaginalis and conservation of size and number among isolates. J. Parasitol. 85, 976–979 24 Vanacova, S. et al. (2003) Molecular biology of the amitochondriate parasites, Giardia intestinalis, Entamoeba histolytica and Trichomonas vaginalis. Int. J. Parasitol. 33, 235–255