Description:
The biogeographic regionalization of the Yucatán Peninsula is examined critically. The proliferation of the names assigned to different biotic units (e.g., Yucatán Peninsula, Yucatán, Yucatanan, Yucatecan, Petén, Petén-Yucatán, Campeche, Campechean, El Petén, and Campechean-Petén) is analyzed, and different problems identified. A unified area-taxonomy is proposed recognizing 3 units: the Yucatán Peninsula province Goldman and Moore, 1945, the Yucatecan district Smith, 1941, stat. nov., and the Petén district Smith, 1941. Smaller biotic units recognized by previous authors that may eventually be considered subdistricts cannot be diagnosed by sets of endemic species, so they are treated as synonyms of the 2 districts recognized in the present proposal.