On 29 January 2010, the IUCN Red List of Threatened Species identified 6,702 (5,913 Animalia (1 Annelida, 1,328 Arthropoda, 3,814 Chordata, 149 Cnidaria, 617 Mollusca, 3 Nemertina, 1 Onychophora), 780 Plantae, 9 Protista) data deficient species.
Lists of data deficient speciesAnimalsAmphibians — List of data deficient amphibiansBirds — List of data deficient birdsFish — List of data deficient fishesInvertebrates — List of data deficient invertebratesArthropods — List of data deficient arthropodsInsects — List of data deficient insectsMolluscs List of data deficient molluscsMammals — List of data deficient mammalsReptiles — List of data deficient reptilesPlants — IUCN Red List data deficient species (Plantae)Chromista / Protista — List of Chromista by conservation status (9 data deficient species)Fungi — List of fungi by conservation status (1 data deficient species)
