Diomea rotundata is a moth of the family Noctuidae first described by Francis Walker in 1857.[1] It is found in Sri Lanka,[2] [3] the Indian subregion, Taiwan,[4] Sumatra, Borneo, the Philippines and Sumba.
Forewings steely greyish black, and marked with black, including prominent discal spots. A larger white mark on the forewing costa can be seen sometimes. There is an irregular black submarginal line which is expanded into blocks sub-dorsally and at one third from the costa, with a smaller block on the costa. Hindwing with a longitudinal rectangle. The caterpillar is a fungus feeder. It is dirty white with indistinct pink marbling. A pink spot is found dorsally at the rear of each segment. The head lacks setae, but with glossy tubercles. Pupation begins on a tree or the fungus in a tight-fitting cocoon which is semi-ovoid in shape.[5]