What is the percentage of spiders in the world?

Spiders make up a significant portion of global biodiversity, with over 48,000 described species. They belong to the class Arachnida, which comprises around 100,000 species, suggesting that spiders represent nearly 48% of all arachnids. However, estimating their percentage compared to all animal species is more complex; there are approximately 1.5 million known animal species, making spiders roughly 3% of that total. Thus, while they are a major group in the arachnid category, their percentage of the entire animal kingdom is relatively small.