Emerald Sentinel: Calumma guillaumeti

Calumma guillaumeti, described by Brygoo, Blanc, and Domergue in 1974, is a high‑altitude chameleon endemic to northeastern Madagascar, particularly the montane rainforests of Marojejy and surrounding massifs. Occupying elevations between 1,250–1,675 m, it thrives in humid, closed‑canopy forest where microclimatic stability supports its cryptic lifestyle. The species honors botanist Jean‑Louis Guillaumet, whose work on Malagasy flora paralleled the ecological intricacy embodied by this reptile. C. guillaumeti belongs to the C. gastrotaenia group. Conservation assessments currently list it as Least Concern, yet export quotas and habitat fragmentation pose latent risks.