Bartomeus, I. Stavert, J. R. Ward, D. Aguado, O. Spanish species per genus from Historical collections as a tool for assessing the global pollination crisis Number of species per genus sampled at the historical surveys of the 1980's compared with the number of species per genus found in recent resurveys (2016). Note some genus have lost more species than others. museums;biodiversity;global change;bees;syrphid flies;butterflies 2018-10-05
    https://rs.figshare.com/articles/dataset/Spanish_species_per_genus_from_Historical_collections_as_a_tool_for_assessing_the_global_pollination_crisis/7171892
10.6084/m9.figshare.7171892.v1