Aim To determine whether a community of phytophagous insects on oceanic islands (the fauna of insects feeding internally on G lochidion trees in south‐eastern P olynesia) was assembled predominantly through niche conservatism or adaptive radiation. Location The islands of south‐eastern P olynesia (southern C ook, A ustral, S ociety, T uamotu‐ G ambier and M arquesas archipelagos) in the C ook I slands and F rench P olynesia. M...