Example image of eyePlorer eyePlorer map for 'Species problem': Biologist Species Organism Evolution Cognition Language Nominalism Philosophical realism Speciation Biological classification Family (biology) Genus Kingdom (biology) Taxon Subspecies Baltimore Oriole Bullock's Oriole Ernst W. Mayr John Ray Binomial nomenclature Carl Linnaeus Charles Darwin On the Origin of Species Gradualism Gregor Mendel Modern evolutionary synthesis Natural selection Edward Bagnall Poulton Theodosius Dobzhansky Reproductive isolation Georges-Louis Leclerc, Comte de Buffon Noah's Ark Systematics Operational definition Platonic realism Natural kind Taxonomy Giraffe Mountain Snowflake Universal (metaphysics) Entity Michael Ghiselin Family resemblance Ludwig Wittgenstein Jody Hey Monism Scientific pluralism David Hull Massimo Pigliucci