The data in the 2011 Annual Checklist have been provided by 99 databases. Of these 22 are new to the 2011 edition and 22 have been updated over the past year. Most datasets include one or more global species database sectors (GSDs), i.e. datasets being developed to cover all of the world's species in a particular group of organisms. A few datasets provide regional information for groups not yet covered globally. The datasets result from collaboration and editing by many expert taxonomists, whose names are found in the datasets themselves. A brief summary is listed below giving: database short and full names; home page on the web; the author(s) or editor(s); organisation; the group for which data are provided, preceded by its higher classification; and the number of species and infraspecific taxa included in this checklist.

Source database descending English name of the group Species
Zygomycetes Pin moulds and related fungi 786
ZOBODAT: Zoological-Botanical Database (Vespoidea) Vespid wasps 5,972
Xylariaceae: Home of the Xylariaceae Fungi associated with dead wood 308
WTaxa: Electronic Catalogue of Weevil names (Curculionoidea) Weevils 98,412
WoRMS Xenoturbellida NEW! 2
WoRMS Thermosbaenacea: World List of Thermosbaenacea NEW! Hot-springs shrimps 35
WoRMS Tantulocarida: World List of Tantulocarida NEW! Tantulocaridans 35
WoRMS Remipedia: World Remipedia Database NEW! Remipedes 24
WoRMS Proseriata and Kalyptorhynchia: World database of Proseriata & Kalyptorhynchia Freeliving flatworms 732
WoRMS Porifera: World Porifera Database Sponges 8,215
WoRMS Polychaeta: World List of Polychaeta NEW! Bristle worms 11,635
WoRMS Ophiuroidea: World Ophiuroidea Database Brittle stars and basket stars 2,152
WoRMS Oligochaeta: World List of Marine Oligochaeta NEW! Earth worms, oligochaetes 914
WoRMS Nemertea: World List of Nemertea NEW! Ribbon worms 1,345
WoRMS Mystacocarida: World List of Mystacocarida NEW! Mystacocarids 13
WoRMS Isopoda: World List of Marine, Freshwater and Terrestrial Isopod Crustaceans NEW! Pillbugs, slaters and woodlice 10,202
WoRMS Cumacea: Cumacea World Database Cumaceans 1,286
WoRMS Bryozoa: World Marine Bryozoa Database NEW! Bryozoans, moss animals 5,686
WoRMS Brachypoda: World List of Brachypoda NEW! Brachypods 12
WoRMS Brachiopoda & Phoronida: Brachiopoda & Phoronida World Databases Lamp-shells and horseshoe worms 422
WoRMS Bochusacea: World List of Bochusacea NEW! 5
WoRMS Asteroidea: World Asteroidea Database NEW! Starfish or sea stars 1,917
World Gracillariidae: Global Taxonomic Database of Gracillariidae Gracillariid moths 1,851
WCSP: World Checklist of Selected Plant Families 99 families of seed plants 106,005
URMO: UNESCO-IOC Register of Marine Organisms Many groups of marine invertebrates and chordates 16,743
UCD: Universal Chalcidoidea Database Chalcidoid wasps 19,847
Trichomycetes Fungi associated with Arthropods 312
TITAN: Cerambycidae database Longhorn beetles, timber beetles 31,408
Tineidae NHM: Global Taxonomic Database of Tineidae (Lepidoptera) Clothes-moths 2,340
TIGR Reptile Database Reptiles 8,656
TicksBase Ticks 869
Taxapad Ichneumonoidea Ichneumonid and braconid wasps 42,372
Systema Dipterorum Flies, mosquitoes, bots, midges and gnats 138,935
SysMyr: Systematic Myriapod Database Diplopods, pauropods and symphylans 10,107
SpmWeb: Spider Mites Web NEW! Spider mites 1,265
SpidCat: The World Spider Catalog Spiders 34,245
Species Fungorum Fungi; protozoan fungi; chromistan fungi 32,872
Species 2000 additional Common Names for the Catalogue of Life 0
Solanaceae Source Nightshade genus 1,084
Scarabs: World Scarabaeidae Database Scarab beetles 29,738
ScaleNet: Systematic Database of the Scale Insects of the World Scale insects 7,090
SalticidDB: Global Species Database of Salticidae (Araneae) Jumping spiders 5,601
Saccharomycetes NEW! Ascomycetous yeast forming fungi 745
Rotifera Database Rotifers 1,996
RJB Geranium: Geranium Taxonomic Information System Cranesbills, geraniums 350
Rhytismatales Tar-spot fungi 507
Psyl'list: Psylloidea database Jumping plant lice 2,107
PlecopteraSF: Plecoptera Species File Stoneflies 3,281
Phyllachorales Tropical tar-spot fungi 1,372
PhasmidaSF: Phasmida Species File Stick and leaf insects 2,959
Parhost: World Database of Fleas Fleas 2,047
OrthopteraSF: Orthoptera Species File Grasshoppers, locusts, katydids, crickets 24,424
Odonata: Catalogue of the Odonata of the World Dragonflies and damselflies 5,746
NZIB: New Zealand Inventory of Biodiversity Various animalian taxa from New Zealand 4,727 Slime moulds 1,034
MOWD: Membracoidea of the World Database NEW! Treehoppers and leafhoppers 15,392
MOST: Moss TROPICOS Database Mosses 13,365
Mites GSDs: TenuipalpidBase Tenuipalpid mites 887
Mites GSDs: RhodacaridBase Rhodacarid mites 145
Mites GSDs: PhytoseiidBase Phytoseiid mites 2,186
Mites GSDs: OlogamasidBase Ologamasid mites 446
MBB: Moss Bug Base Moss bugs 32
MantodeaSF: Mantodea Species File Praying mantids 2,403
LIAS: A Global Information System for Lichenized and Non-Lichenized Ascomycetes NEW! Lichens 5,499
LHD: Lacistemataceae Holistic Database Waits Numi plant family 28
LepIndex: The Global Lepidoptera Names Index Butterflies and moths 243,006
LecyPages: The Lecythidaceae Pages Brazil nut family 311
LDL Neuropterida Species of the World Lacewings, antlions, owlflies, fishflies, dobsonflies & snakeflies 6,256
ITIS: The Integrated Taxonomic Information System Wide range of taxa in all kingdoms 136,921
ITIS Bees: World Bee Checklist Bees 20,455
IOPI Global Plant Checklist Cycads and 6 families of seed plants 24,025
ILDIS World Database of Legumes Legumes 19,949
ICTV/MSL: International Committee on Taxonomy of Viruses / Master Species List Viruses and subviral agents 2,083
Hexacorals: Hexacorallians of the World Sea anemones 738
Glomeromycota Glomeromycota 166
GloBIS (GART): Global Butterfly Information System Swallowtails and whites 1,635
GCC: Global Compositae Checklist Aster or sunflower family 29,649
FWCrabs: Neotropical Freshwater Crabs Catalogue Freshwater crabs 46
FLOW: Fulgoromorpha Lists On the WEB Planthoppers 10,672
FishBase Fishes 31,725
ETI WBD: World Biodiversity Database (Euphausiacea) Krill 86
EmbiopteraSF: Embioptera Species File NEW! Webspinners 330
ELPT: Early Land Plants Today - Uniting Taxonomy, Nomenclature & Geography (liverworts and hornworts) Hornworts and liverworts 676
Droseraceae Database Sundew family 182
Dothideomycetes NEW! 2,858
CunaxidBase: Family Cunaxidae Database NEW! Cunaxid mites 329
COOL: Cercopoidea Organised On Line Froghoppers 2,364
Conifer Database Conifers 619
CIPA: Computer Aided Identification of Phlebotomine sandflies of Americas Phlebotomine sandflies 402
ChiloBase: A World Catalogue of Centipedes (Chilopoda) for the web Centipedes 3,146
CCW: Catalogue of Craneflies of the World Craneflies 14,834
Brassicaceae species checklist and database Crucifers, mustard or cabbage family 3,778
BlattodeaSF: Blattodea Species File Cockroaches 4,431
BIOS: Bacteriology Insight Orienting System Bacteria, archaea 6,749
AphidSF: Aphid Species File Aphids and allied groups 4,867
AnnonBase: World Species List of Annonaceae Custard apples 2,236
AlgaeBase Seaweeds and other algae, including blue-green algae (cyanobacteria) 31,028
AFD: Australian Faunal Directory (Pulmonata) Snails and slugs (some groups) 947
3i Typhlocybinae: 3i interactive keys and taxonomic databases, subfamily Typhlocybinae NEW! Leafhoppers 4,450
3i Cicadellinae: 3i interactive keys and taxonomic databases, subfamily Cicadellinae NEW! Leafhoppers 2,147