Fig. 2.

Cumulative number of described cichlid species over time. The number of described species increased over the years steadily with a major increment around 1900, by the extensive work by George Boulenger, followed by a second steep ascent between the 1940's and the 1980's due to Max Poll's contributions. Note that only currently valid species are included, all later synonymized species are not considered in this study (see Table 1 for references).