Describe the most diverse and abundant group of animals on Earth. Solution Arthopods are the most diverse groupdominating earth in terms of number of species and abundance of species occupying almose every concievable niches. The phylum includes insects, arachinids(spiders mites , crustaceans (crabs, shrimps, lobesters) , millipedes and centipedes . The phylum has its own characteristic features like exoskelton , bilateral symmetry and jointed appandages . The most common classes in the phylum arthopoda are Crustacea, Arachinida Chilopoda Diplopoda Hope it helps, GoodLuck Regards...