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The ecoregion includes several island groups lying east of the eastern peninsula of the island of New Guinea, including the D'Entrecasteaux Islands, Trobriand Islands, and Woodlark Island.
Étienne Mulsant described C. montrouzieri, naming the new species after a Marist brother and missionary, Abbe Montrouzier, who wrote an "Insect Fauna of Woodlark Island".