Biodiversity, 1994

Animalia: 1,095,000 Living Known Species; Porifera; Amphibia; Mammalia; Cnidaria/Ctenophora; Echinodermata; Reptilia; Nematoda; Aves; Minor Phyla; Lower Chordates/Fishes; Platyhelminthes; Annelida; Arachnida; Smaller Insect Orders; Other Anthropod Classes; Mollusca; Diptera; Homoptera/Hemiptera; Coleoptera; Lepidoptera; Hymenoptera; These figures have been rounded to the nearest thousand. There is not universal agreement on the exact numbers of living known species.