Global Biodiversity Information Facility

http://www.gbif.org/

http://biodiversity-chm.eea.europa.eu/

EUNIS - European Nature Information System

http://eunis.eea.europa.eu/

EIONET - European Topic Center on Biological Diversity

http://biodiversity.eionet.europa.eu/

http://www.bioplatform.info/

Resource Identification for a Biological Collection Information Service in Europe

http://www.bgbm.fu-berlin.de/biocise/

Biological Collection Access Services. European biological collections at your fingertips

http://www.biocase.org/

Species 2000

http://www.sp2000.org/

ITIS - Integrated Taxonomic Information System

http://www.itis.usda.gov/