The Integrated and Open Database is a public database integrating different kinds of data on European Butterflies. On the basis of an updated and widely accepted taxonomy, the IO database provides a large array of information for each species. This data can be freely used in the study of butterfly biogeography, ecology, evolution and to assess conservation strategies. For each species, the following information is provided and can be freely downloaded:

  1. Published sequences of the barcoding gene (658 bp cytochrome oxidase subunit 1), aligned, geo-referenced and verified.
  2. Occurrence data collected in many published studies and obtained by published maps.
  3. A list of host plants (Order, Family and Genus).
  4. A list of species traits selected among the most representative for butterfly ecology.
  5. A list of references indicating information sources.