Figure 2 from: Dunlop J, Penney D (2012) Summary statistics for fossil spider species taxonomy. ZooKeys 192: 1-13. https://doi.org/10.3897/zookeys.192.3093

Figure 2 - The numbers of described fossil spider species by year. Note that data for the 126 years where no fossil spider species were described are not included. Hence, the actual lull periods between peaks of activity are artificially shortened in this graph. For example, the period between the first described fossil spider in 1822 and the next data plot is actually 32 years. Squares = newly described fossil spider species, triangles = cumulative number of described fossil spider species. Data derived from Dunlop et al. (2012).