Biology
Pie Chart of Described Animal Species by Phylum
Last reviewed on 2026-05-22.
Biology — verifiable data, editable template
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Of ~1.5 million described animal species, arthropods (insects, crustaceans, arachnids) dominate, accounting for over 80% of all known animal species. Chordates (including all vertebrates) are a small fraction.
The data
- Arthropoda — 80 %
- Mollusca — 5 %
- Chordata — 5 %
- Platyhelminthes — 2 %
- Nematoda — 2 %
- Annelida — 1 %
- Other — 5 %
Source
IUCN species counts / Zhang's animal taxonomy.
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