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The Methods and Principles of Systematics
Taxonomic Characters and Their Variation
Phenomena of Geographic Variation
9 other sections not shown
allopatric American analysis animals authors barriers Bibliography biological breeding changes chapter classification color complete described developed discontinuous discussion distinct distribution Dobzhansky 1941a Drosophila ecological races edition evolution evolutionary example exist fact factors fauna forms gall wasps gaps gene genera geneticist genus geographic races geographic speciation geographic variation Goldschmidt groups Guinea habitat higher categories hybrid zone illustrations important Index insects interbreeding intergradation islands isolating mechanisms known lakes localities males mammals mating Mayr modern monotypic morphological mountain mutations nature North number of species occur origin of species overlap Palearctic Paperbound parthenogenesis particularly percent phenotypical phylogenetic physiological polymorphism polytypic species populations puzzles range reason recent related species Rensch reproductive isolation seems selection separated sibling species similar single snails Solomon Islands species concept species definition species formation species of birds specimens subspecies superspecies sympatric speciation systematic systematist taxonomic taxonomic characters taxonomist tion variability