Domenico Fulgione and Daniela Rippa
When the then 37 years old Dobzhansky wrote these words the problem of identifying a universally acceptable concept of species already had a long and respectable history. Unfortunately, despite much effort and painstaking attempts by eminent scholars such as Ernst Mayr and Massimo Pigliucci, the definition of species still defies a unitary concept today.
English 
Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Telugu