Approximately how many insect species have been described, and what fraction of the animal kingdom do insects represent?

Approximately how many insect species have been described, and what fraction of the animal kingdom do insects represent?

• A. 600,000 species, about one third
• B. 1,000,000 species, one half
• C. 400,000 species, one quarter
• D. 800,000 species, half of animal kingdom

Answer: (D)

Insects are the most diverse group of animals, making up roughly half of all described animal species. About 800,000 insect species have been described, reflecting their enormous diversification across many habitats and ecological roles. This immense variety means insects account for a large share of the animal kingdom by species count, around 50%. So the option that identifies about 800,000 described insect species and about half of the animal kingdom matches these commonly taught estimates. Other numbers underestimate either how many insect species exist or how large their share of animal diversity is, which is why this choice is the best fit.

Insects are the most diverse group of animals, making up roughly half of all described animal species. About 800,000 insect species have been described, reflecting their enormous diversification across many habitats and ecological roles. This immense variety means insects account for a large share of the animal kingdom by species count, around 50%. So the option that identifies about 800,000 described insect species and about half of the animal kingdom matches these commonly taught estimates. Other numbers underestimate either how many insect species exist or how large their share of animal diversity is, which is why this choice is the best fit.