Fig. 4 in Hoverflies (Diptera: Syrphidae) of El Ventorrillo Biological Station, Madrid province, Spain: a perspective from a late twentieth century inventory

Fig. 4. Biogeographic diversity of El Ventorrillo hoverflies. Species known to be present in each biogegraphic zone of Europe, expressed both in species richness (within grey bar) and percentage (above bar) calculated from the total number of species found at El Ventorrillo. Notice that a species can be present in more than one biogeographic zone.Published as part of Lorenzo, Daniel, Ricarte, Antonio, Nedeljković, Zorica, Nieves-Aldrey, José Luis & Marcos-García, Maria Ángeles, 2020, Hoverflies (Diptera: Syrphidae) of El Ventorrillo Biological Station, Madrid province, Spain: a perspective from a late twentieth century inventory, pp. 393-412 in Revue suisse de Zoologie 127 (2) on page 400, DOI: 10.35929/RSZ.0029, http://zenodo.org/record/574391