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 species
Animals
Amphibians — List of data deficient amphibians
Birds — List of data deficient birds
Fish — List of data deficient fishes
Invertebrates — List of data deficient invertebrates
Arthropods — List of data deficient arthropods
Insects — List of data deficient insects
Molluscs List of data deficient molluscs
Mammals — List of data deficient mammals
Reptiles — List of data deficient reptiles
Plants — 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)
