Categories
Major groups should be given their own categories. When possible, these should use the common name in the plural. In general, only articles about major subgroups should be added, and more specific articles should be included in subcategories. However, when there are only a few articles about members of the group, they can all go directly into the main category. Use your judgement on when to split, aiming for an approximate category size of 10-50 articles.
Note that in addition to taxa, categories may also contain informal subgroups. For instance Category:Primates may include an article or subcategory for monkeys, although they are not treated as a formal group. They may also include some other articles that pertain specifically to members of the group, although they are not about them.
Categories related to the biota of a region should be based on the common grouping of that region used by zoological, botanical, mycological etc. publications. For example, if it is common to separate a region based on political boundaries (as in parts of Europe), categories should be separated by countries. If it is common to separate regions based on geographic features (such as New Guinea), categories should be separated by geographic region.
Read more about this topic: Wikipedia:WikiProject Tree Of Life
Famous quotes containing the word categories:
“All cultural change reduces itself to a difference of categories. All revolutions, whether in the sciences or world history, occur merely because spirit has changed its categories in order to understand and examine what belongs to it, in order to possess and grasp itself in a truer, deeper, more intimate and unified manner.”
—Georg Wilhelm Friedrich Hegel (1770–1831)
“The analogy between the mind and a computer fails for many reasons. The brain is constructed by principles that assure diversity and degeneracy. Unlike a computer, it has no replicative memory. It is historical and value driven. It forms categories by internal criteria and by constraints acting at many scales, not by means of a syntactically constructed program. The world with which the brain interacts is not unequivocally made up of classical categories.”
—Gerald M. Edelman (b. 1928)
“all the categories which we employ to describe conscious mental acts, such as ideas, purposes, resolutions, and so on, can be applied to ... these latent states.”
—Sigmund Freud (1856–1939)