Arthropods (Arthropoda)---Insects (Insecta)----Beetles (Coleoptera) Beetles are one of the most well-known insects, especially Ladybirds. With most of them having the infamous "Wing shields" they are also one of the easiest to identify. Any insect with two elytra (Wing shields) a thorax, a head, and six legs is most likely a beetle. They can be found in an array of habitats and some species don't like beetles at all! Rove Beetles are a prime example. Beetles are the largest group of insects, and all the species equal to about one quarter of all of Earth's life!