The IUCN Red List includes data on each of the 6,260 amphibian species currently known to science (as of the end of 2007). The types of data included in this database are described below. The process of collecting and reviewing the data and making the assessments is described in detail in the amphibian assessment process.
The following data are provided for each species in the online searchable database:
Species, genus, family, order, taxonomic authority, commonly-used synonyms, English and other common names (if any), and taxonomic notes (if needed, normally used to clarify difficult or confusing issues). The default taxonomy for amphibians on the IUCN Red List is Amphibian Species of the World, and only departs from this in well-justified circumstances.
General text information on: geographic range, population (usually a subjective assessment of abundance in the absence of quantitative information), habitat and ecology (including both breeding and non-breeding habitats, and breeding strategy [i.e., larval development, direct development, viviparous]), major threats and conservation measures (in particular noting occurrence in protected areas).
Based on the information above, the following is determined: IUCN Red List Category, IUCN Red List Criteria, Rationale for the Red List assessment, reason for any change from previous assessments (i.e., genuine change in status of species, new or better information available, incorrect information used previously, taxonomic change affecting the species, previously incorrect application of the Red List Criteria), current population trend (i.e., increasing, decreasing, stable, unknown), date of assessment, names of assessors, and any notes relating to Red Listing (e.g., any important issues in deciding the Category). It should be noted that for certain species endemic to Brazil, there was not time to reach agreement on the Red List Categories between the Amphibian Coordinating Team, and the experts on the species in Brazil. The Red List Categories displayed are those that were agreed at the GAA Brazil workshop in April 2003. However, in the subsequent consistency check conducted by the Amphibian Coordinating Team, many of these were found to be inconsistent with the approach adopted elsewhere in the world. Under the notes on Red Listing, the likely consistent Red List Category is given for these species, and it is these consistent Red List Categories that are used in the Analysis of Amphibians on the the 2008 IUCN Red List presented here.
A geographic distribution map of the Extent of Occurrence for each species. The IUCN Red List includes distribution maps for 6,157 of the 6,260 amphibian species. Maps are missing for species that are known only from non-specific type localities. The maps are in the form of polygons that join known locations. A species' distribution map can consist of more than one polygon where there is an obvious discontinuity in suitable habitat.
As well as the map included with each individual species account, the individual shapefiles (.shp) are also available for download in batches by Order.
A list of countries of occurrence is given, noting whether it is native extant, extinct, introduced and/or re-introduced.
Each species is coded against a standardized list of habitats, the IUCN Habitats Classification Scheme, and coded for suitability and relative importance.
Each species is coded against a standardized list of threats, the IUCN Threats Classification Scheme, and coded for whether the threat is acting in the past, present or future, or is an ongoing threat.
Each species is coded against a standardized list of conservation actions, the IUCN Conservation Actions Classification Scheme, and coded for whether this measure is "In Place" or "Needed".
Each species is coded against the IUCN Utilisation Authority File (focusing on the purpose/type of use, the primary forms removed from the wild, and the source of specimens in commercial trade).
A listing of important references for each species.