Currently the classification of "Mammillaria" is in a state where few newly discovered species are likely, though some new species may yet be found when the chaos of names created earlier by commercial plant collectors is sorted out. Many names that were introduced for plants barely differentiated by a shade of flower colour or variation in spination were eliminated in attempt to make the use of names consistent with the rest of the botanical world. The number of taxa, which at one time numbered above 500, is now below 200. Some genera ("Dolichothele, Mammillopsis, Krainzia" and others) have been merged back into "Mammillaria", and others like "Coryphantha", "Escobaria" and "Mammilloydia" were confirmed as separate.