Though the true dimensions of species diversity remain uncertain, estimates range from 2.6–7.8 million species with a mean of 5.5 million. This probably represents less than 20% of all species on Earth[citation needed], and with only about 20,000 new species of all organisms being described each year, most species likely will remain undescribed for many years unless species descriptions increase in rate. About 850,000–1,000,000 of all described species are insects. Of the 24 orders of insects, four dominate in terms of numbers of described species, with at least 3 million species included in Coleoptera, Diptera, Hymenoptera and Lepidoptera. A recent study estimated the number of beetles at 0.9–2.1 million with a mean of 1.5 million. COUNT 5
QSN1 The true diversity within the insect species remains what? ANS1 uncertain QSN2 How many insect species are estimated to exist? ANS2 2.6–7.8 million species QSN3 How many new species of all organisms are discovered each year? ANS3 20,000 QSN4 Of all the species on earth, how much do insects make up? ANS4 less than 20% QSN5 For many years to come, most insect species will remain as what? ANS5 undescribed