Comparison of some numerical data between the belisama group of the genus Delias Hübner (Insecta: Lepidoptera) from Bali Island, Indonesia
In taxonomic study of closely related taxa, numerical data seem to be insufficiently used or discussed. In this study actual sizes of various parts in male genitalia and their ratios (to forewing length) are compared and discussed. Generally ratios are considered to be useful for eliminating the environmental effects, as seen in the case that male genitalia of Delias oraia are proved clearly larger than those of Delias belisama. Meanwhile it is clarified through the discussion that there are such a character that is hardly effected by the environment, and that is therefore very important to discuss the speciation and biological evolution in related taxa.
KeywordsBiological Evolution Related Taxon Male Genitalia Classification Society Phallus Length
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