Aretaon muscosus

While in the sister species Aretaon asperrimus only occasionally nymph with a clear green component appear in the coloration, the nymphs of Aretaon muscosus are always colored green. The adult females are also intensely green in color. At 72 to 74 millimetres (2.8 to 2.9 in), they remain somewhat smaller than those of Aretaon asperrimus. Their most noticeable feature are the lobes or leaf-like extensions on the edges of the abdomen. They exist from the first through the eighth segments, with the largest being on segments three through seven. The dorsal edges of the tibiae are equipped with easily recognizable spines. Their color and body structure make them look like they are overgrown with moss. The rather golden yellow and brown patterned males reach a size of 49 to 50 millimetres (1.9 to 2.0 in). They too have lobes on the edges of the abdomen, which can be found here on segments three to nine. Like the abdominal segments themselves, they also gradually increase in size towards the end of the abdomen.

Aretaeon muscosus occurs in the Malay part of Borneo, more precisely in the northwestern state of Sarawak. There the species was found in the Gunung Mulu National Park. For most syntypes, Kinabalu in Sabah is given as the place where it was found. As with Aretaon asperrimus, Rehn and Rehn state that they also examined specimens from the island Labuan from the collection of Morgan Hebard in Aretaon muscosus.