Most numerous species?
Insects/invertebrates are the most numerous animal species. Invertebrates make up 95% of the world’s animal species. Invertebrates include Arachnids Bees,Wasps,Ants,and sawflies Butterflies and moths Crustaceans Mollusks Flies Beetles Cnidarians Roundworms Flatworms Segmented Worms Arthropods which include insects, are the most abundant invertabrates There are at least 1.3 million known species of invertabrates. Most are small, some are enormous. All lack vertabraes- backbones. There is a HUGE population of beetles! About one in every four animals on Earth is a beetle. I hope I helped.