Mullerian-mimicry
Guides
Moneilema gigas
Giant Cactus Longhorn Beetle, Cactus Longhorn Beetle
Moneilema gigas is a large, flightless longhorn beetle endemic to the Sonoran Desert. Adults and larvae feed on cacti, particularly chollas, prickly pear, and saguaro seedlings. The species exhibits Mullerian mimicry of noxious stink beetles (Eleodes). Phylogeographic studies indicate northward range expansions following Pleistocene climate changes, with populations expanding from multiple glacial refugia.