Designation (of Greek taxis = order, nomos = law) for the division into a hierarchical system. In biology, living beings such as animals, plants and viruses are hierarchically divided into groups (taxa) according to their natural relationship. First attempts were already in the antiquity For example, by the Greichischen Naturforscher Theophrastus (370-287 BCE).
The Swedish botanist Carl von Linné (1707-1778) developed the foundations of modern taxonomy and introduced the concept of "species" into biological systematics. In 1735 he published the work "Fundamenta Botanica", in which he explained for the first time in detail his ideas for the transformation of the foundations of botany. His official botanical author abbreviation is "L.". However, Linnae's classification system did not yet include all the usual categories or levels today. These are not always used in all plants or animals. The usage depends on how complex each unit is. The three main categories almost always mentioned in professional sources are family-genus-type . Each category can still be broken down into "lower levels" (subspecies). Likewise, as the last lower level of a main category, an "upper level" can be created, which then stands above the next main category (superdiviso).