图1 《濒危野生动植物种国际贸易公约》物种概念的内涵和外延。其“物种”概念内涵是生物学家认定的“物种”, 但其外延则扩大到“物种”以上的分类单元, 如“属”、“科”, 甚至可能是“目”, 以及一个“属”、一个“科”或是一个“目”的部分物种, 还甚至可能指一个“种”的亚种和种群。

Fig. 1 Connotation and extension of the species concept used by the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). The connotation of species concept used by CITES is the connotation by name of the species recognized by biologists, whereas the extension of the concept is extended to as being all of the species included in a higher taxon, such as “genus”, “family” or even “order”, or designated part thereof. Species of CITES may also refer to subspecies or population.