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Folder ... worldwide?

Estimates of the total number of species range from 7 to 100 million, with a probably good estimate being around 13 to 15 million species. Up to this day, only about 1.95 million living species have been identified and described scientifically. Many new species continue to be discovered each year, most of them invertebrates. During the 2000-2010 decade, the number of newly described species averaged 17.000 per year.

The table below shows approximate numbers of species in major groups :

IISE (2011) State of Observed Species. Tempe, AZ. International Institute for Species Exploration)

GroupNo. of described species
Insecta 1 023 430
Plantae 285 885
Arachnids 105 055
Fungi 101 702
Crustacea 48 719
Mollusca 86 506
Prokaryotes 8838
Protoctista 29 470
Fishes 31 972
Nematoda 25 519
Platyhelminthes 20 442
Annelida 17 109
Amphibia 6 792
Chromista 46 346
Cnidaria 10 050
Reptilia 8 983
Porifera 6 107
Mammalia 5 569
Algae 12 340
Echinodermata 7 065
Tunicata 2 816
Aves 10 004
Hemichordata 111
Other invertebrates 41 045
Other Chordates 149
Totals 1,941,939

Pointer Global Biodiversity Outlook 1 (2001)
Pointer Global Biodiversity Outlook 2 (2006)
Pointer Global Biodiversity Outlook 3 (2010)
Pointer Global Biodiversity Outlook 4 (2014)
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