<P> Animals can be divided into two broad groups: vertebrates (animals with a backbone) and invertebrates (animals without a backbone). Half of all described vertebrate species are fishes and three - quarters of all described invertebrate species are insects . Over 95% of the described animal species in the world are invertebrates . </P> <P> The following table lists the number of described living species for each major animal subgroup as estimated for the IUCN Red List of Threatened Species, 2014.3 . </P> <Table> <Tr> <Th> Group </Th> <Th> Image </Th> <Th> Subgroup </Th> <Th> Estimated number of described species </Th> </Tr> <Tr> <Th> Vertebrates </Th> <Td> </Td> <Td> Fishes </Td> <Td> 32,900 </Td> </Tr> <Tr> <Td> </Td> <Td> Amphibians </Td> <Td> 7,302 </Td> </Tr> <Tr> <Td> </Td> <Td> Reptiles </Td> <Td> 10,038 </Td> </Tr> <Tr> <Td> </Td> <Td> Birds </Td> <Td> 10,425 </Td> </Tr> <Tr> <Td> </Td> <Td> Mammals </Td> <Td> 5,513 </Td> </Tr> <Tr> <Td_colspan="3"> Total vertebrate species: 66,178 </Td> </Tr> <Tr> <Th> Invertebrates </Th> <Td> </Td> <Td> Insects </Td> <Td> 1,000,000 </Td> </Tr> <Tr> <Td> </Td> <Td> Molluscs </Td> <Td> 85,000 </Td> </Tr> <Tr> <Td> </Td> <Td> Crustaceans </Td> <Td> 47,000 </Td> </Tr> <Tr> <Td> </Td> <Td> Corals </Td> <Td> 2,000 </Td> </Tr> <Tr> <Td> </Td> <Td> Arachnids </Td> <Td> 102,248 </Td> </Tr> <Tr> <Td> </Td> <Td> Velvet worms </Td> <Td> 165 </Td> </Tr> <Tr> <Td> </Td> <Td> Horseshoe crabs </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Others </Td> <Td> 68,658 </Td> </Tr> <Tr> <Td_colspan="3"> Total invertebrate species: 1,305,075 </Td> </Tr> <Tr> <Th_colspan="4"> Total for all animal species: 1,371,253 </Th> </Tr> </Table> <Tr> <Th> Group </Th> <Th> Image </Th> <Th> Subgroup </Th> <Th> Estimated number of described species </Th> </Tr>

How many species are in the animalia kingdom