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The Methods and Principles of Systematics
Taxonomic Characters and Their Variation
Phenomena of Geographic Variation
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allopatric analysis authors biological breeding season butterflies chapter classification color considered correlated described developed discontinuities discussion distinct distribution Dobzhansky 1941a Drosophila ecological races evidence evolution evolutionary example exist fact factors fauna fertile forms gall wasps gaps gene genera genetic basis geneticist genus geographic races geographic speciation geographic variation Goldschmidt graphic Guinea habitat higher categories hybrid zones important individual variation insects interbreeding intergradation islands isolating mechanisms known lakes less localities males mammals mating Mayr monotypic morphological mountain mutations nature North number of species occur origin of species overlap Palearctic parthenogenesis particularly percent phase phenotypical phylogenetic physiological polymorphism polytypic species range reason recent related species Rensch reproductive isolation seems separated sibling species similar single snails Solomon Islands species concept species definition species formation species of birds specimens subspecies superspecies sympatric speciation systematist taxonomic taxonomic characters taxonomist tion variability