Biogeographical Provinces of the World

Biogeographical realms were established by Udvardy on the basis of geographic and historic elements, utilizing ground-breaking work as appears on this topic in the published literature. Udvardy's paper makes reference to at least three preceding reports on this topic, and also includes an extensive bibliography of five pages. There are 8 biogeographical realms recognized by Udvardy in Paper #18: the Palearctic, the Nearctic, the Afrotropical, the Indomalayan, the Oceanian, the Australian, the Antarctic and the Neotropical.