分类学可定义为按照它们的已证明了的或推测的系统发育关系而建立的各种生物的科学性的分类.这个界说在分类学中屏除了不是根据实在的或凝议的系统发育关系的分类.只是为了参考或鉴定的便利而建立的如生态学的分类或“人为的”分类.它只包括所谓“自然的”分类,不论自然的这一辞是用在“逻辑的”意义上或等同于“系统发育的”. Taxonomy can be defined as the scientific classification of the various organisms that have been established in accordance with their proven or putative phylogenetic relationships This definition is taxonomically categorized in terms of phylogenetic relationships that are not based on actual or conformation Just for the purpose of reference or identification, such as ecologic or “artificial.” It includes only so-called “natural” categories, regardless of the nature of the phrase used in the “ Logical ”or equivalent to “ phylogenetically ”.