The most studied insect orders are Diptera, Hymenoptera, Lepidoptera, Psocoptera, Odonata, Ephemeroptera, Trichoptera and Dermaptera. About 4,000 insect species are recorded, showing high endemism at the species and genus levels. Notable are the giant coconut grasshopper ("Pseudophyllanax imperialis") and other endemic insects including an ant ("Cerapachys cohici"), a cicada "Kanakia typica", a damselfly "Caledopteryx maculata" a longhorned beetle "Buprestomorpha montrouzieri", a phasmid "Gigantophasma bicolor" and a leafcutting bee "Eutricharaea australis". There are 521 species of Lepidoptera, with 197 endemic (38%), notably the butterfly Montrouzier's swallowtail ("Papilio montrouzieri"), "Graphium gelon", "Polyura gamma", "Paratisiphone lyrnessa", "Austroypthima petersi" and a sphinx moth "Compsulyx cochereaui".