Fig. 2. Lissamphibian biodiversity through time. A in Assessing confidence intervals for stratigraphic ranges of higher taxa: The case of Lissamphibia

Fig. 2. Lissamphibian biodiversity through time. A. Number of species found in each geologic stage. B. Standardized species numbers, calculated to account for uneven stage durations. C. Number of lineages, obtained by adding the number of recorded species and the number of ghost lineages for each geologic stage. Major biological crises identified in other taxa are shown as continuous gray lines. Minor crises that may have affected lissamphibians are shown as dashed gray lines. Since most post−Miocene species are excluded, this figure ends with the terminal Miocene. Minimum (white) and maximum (black) values have been calculated under various assumptions about the age of several middle Miocene species and the status of specimens with questionable affinities. The geologic timescale follows Gradstein et al. (2004) in all figures. Abbreviations: J, Jurassic; K, Cretaceous; M, Miocene; O, Oligocene; P, Permian; Pg, Paleogene; Tr, Triassic.