Several eminent naturalists have of late published their belief that a multitude of reputed species in each genus are not real species;
Espezieak aldagarriak direla uste izatera hel dadin orok, zerbitzu ona eginen du bere komentzimendua onestki adieraziz, horrelaxe soilki ken baitaiteke gai honen inguruan dauden aurreritzi ugarien zama.