. Includes terrestrial groups like insects, spiders, millipedes, centipedes as well as predominantly marine groups like crustaceans and sea spiders. 1,242,040 species, including 6,182 fossil species. Many species have yet to be discovered.
Arthropods is a group of animals
. There are 1106738 species of arthropods, in 108036 genera and 4096 families. Arthropoda (arthropods) includes groups like Trilobites
, and Chelicerates