How Many Animal Species Inhabit Our Planet

Animals: estimated 3-30 million species
|
|--Invertebrates: 97% of all known species
| `--+--Sponges: 10,000 species
| |--Cnidarians: 8,000-9,000 species
| |--Molluscs: 100,000 species
| |--Platyhelminths: 13,000 species
| |--Nematodes: 20,000+ species
| |--Annelida: 12,000 species
| `--Arthropods
| `--+--Crustaceans: 40,000 species
| |--Insects: 1-30 million+ species
| `--Arachnids: 75,500 species
|
`--Vertebrates: 3% of all known species
`--+--Reptiles: 7,984 species
|--Amphibians: 5,400 species
|--Birds: 9,000-10,000 species
|--Mammals: 4,475-5,000 species
`--Ray-Finned Fishes: 23,500 species

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