RELATIONSHIP AMONG HYDROTAEA SPECIES BASED ON ALLOZYMES, KARYOTYPE AND MORPHOLOGY (DIPTERA, MUSCIDAE)

Allele frequencies at 12 allozyme loci are presented together with the karyotypes of six Hydrotaea species, H. irritans, H. meridionalis, H. velutina, H. pellucens, H. pandellei, and H. meteorica. For these six , and two further species, H. albipuncta and H. borussica, the allozym e data are used to construct phylogenetic trees. Relatedness as estima ted on basis of these trees was then compared to similarity in karyoty pe and morphology. Conclusions based on allozymes, karyotype, and morp hology, were mainly qualitatively similar. Genetic analyses and morpho logy coincided to the conclusion that H. irritans, H. pandellei, and H . pellucens belong to one group of closely related species, and that H . albipuncta and H. meteorica were least related to the other species analysed and also rather distinct from each other. Finally, the three species, H. meridionalis, H. borussica, and H. velutina were equally d ifferent from each other and the irritans-subgroup when judged by allo zyme data, but based on karyotype and morphology, H. meridionalis and H. borussica, but not H. velutina, could be considered as part of the irritans subgroup.