Fraction of 3,623 terrestrial invertebrate species and of 1,306 marine invertebrate species that are classified as threatened with extinction

Range terrestrial species 42%: marine species 25% %
Organism Invertebrates
Reference Ceballos G, Ehrlich PR, Dirzo R. Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines. Proc Natl Acad Sci U S A. 2017 Jul 25 114(30):E6089-E6096. doi: 10.1073/pnas.1704949114 p.E6089 left column bottom paragraphPubMed ID28696295
Primary Source [16] Collen B, Böhm M, Kemp R, Baillie J (2012) Spineless: Status and Trends of the World’s Invertebrates (Zoological Society of London, London).
Method Abstract: "That conclusion is based on analyses of the numbers and degrees of range contraction (indicative of population shrinkage and/or population extinctions according to the International Union for Conservation of Nature) using a sample of 27,600 vertebrate species, and on a more detailed analysis documenting the population extinctions between 1900 and 2015 in 177 mammal species."
Comments P.E6089 left column bottom paragraph: "Regarding global extinction of invertebrates, available information is limited and largely focused on threat level. For example, it is estimated that 42% of 3,623 terrestrial invertebrate species, and 25% of 1,306 species of marine invertebrates assessed on the International Union for Conservation of Nature (IUCN) Red List are classified as threatened with extinction (primary source)."
Entered by Uri M
ID 117264