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Class Insecta (the insects) under Arthropoda seems to have the highest count on earth. Even approximating the count is difficult but estimates amount up to ten quintillion (10,000,000,000,000,000,000) individuals alive at any one moment.

Arthropoda itself has the greatest number of animal species described of any phylum, at over one million. Of any of these, krill are estimated at having the highest total biomass, something over a half billion tonnes (Note that non-animal biomass, for example bacteria or plants, is higher).

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