Cytogenetic Relationships of Drosophila Affinidisjuncta Hardy

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Abstract
Cytological investigations of the mitotic metaphase chromosomes in the D. disjuncta-D. bostrycha species complex have led to the discovery of a new species of the picture-winged group, D. affinidisjuncta Hardy from West Maui [Hawaii, USA]. Interspecific variation of metaphase karyotype is due to the amount and distribution of heterochromatin in the chromosome complement. The results of hybridization tests among these 3 homosequential species verify the full-fledged species status of the new species. The cytological method is useful as a diagnostic tool for the recognition of species in this cluster of morphologically very similar species. This metaphase chromosome technique may have potentially wide application in systematic and evolutionary studies of the endemic Hawaiian drosophilids.

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