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Introduction to the Arthropoda Since many arthropod species remain undocumented or undiscovered, especially in tropical rain forests, the true number of living arthropod species is probably in the tens of millions One recent conservative estimate puts the number of arthropod species in tropical forests at 6 to 9 million species (Thomas, 1990)
The biodiversity of species and their rates of extinction . . . Different visualizations of species biodiversity (A) The distributions of 9927 bird species (B) The 4964 species with smaller than the median geographical range size (C) The 1308 species assessed as threatened with a high risk of extinction by BirdLife International for the Red List of Threatened Species of the International Union for Conservation of Nature (D) The 1080 threatened species
Is biodiversity loss increasing or decreasing? | Royal Society Is the rate of biodiversity loss increasing or decreasing? Compared to the 1 6 million species known about on Earth, the number of recorded extinctions can seem very low Since 1500AD there have been 711 vertebrates, and around 600 invertebrates and plants known to have gone extinct but the actual number is likely to be considerably greater
Biodiversity and Development - Conserving Biodiversity - NCBI . . . Current estimates of the Earth's total species diversity range from 10 million to 100 million (Wilson, 1988; Ehrlich and Wilson, 1991; Erwin, 1991) Thus, as Wilson (1988) has pointed out, we do not know even to within the nearest order of magnitude the number of species on the planet