It should be remembered that systematists are far from being pleased at finding variability in important characters, and that there are not many men who will laboriously examine internal and important organs, and compare them in many specimens of the same species.
Gogorarazi beharra dago sailkatzaileak ez direla gustura egoten ezaugarri inportanteetan aldagarritasunik aurkitzean, eta asko ez daudela prest barne-organo inportanteak lantsuki aztertzeko eta epezie bereko aleetan konparatzeko.