Definition: A taxon is Endangered when the best available evidence indicates that it meets any of the \r\ncriteria A to E for Endangered, and it is therefore considered to be facing a very high risk of extinction in the wild.
Definition: A habitat that is in or on a body of water containing low concentrations of dissolved salts and other total dissolved solids (<0.5 grams dissolved salts per litre).
Comment: "Small" is ambiguous. For details on "Small lakes" (e.g. Cameroon crater lakes) see http://worldwildlife.org/biomes/small-lake-ecosystems. This class will be replaced with a less ambiguous class.