R. Martin described this species in 1902, its name specify eight dark spots on two pairs of wings (octo = eight, maculatus = spots). It is a medium-large sized damselfly and like other lestid, it opens the wings at rest. Though being quite large, the species is elongate with a long abdomen. The body is greenish with somehow yellowish marking. Last segments of the abdomen are blue on dorsum. Male and female of the species are dimorphism. The wings of male are hyaline with two distinct dark spots on each, these characteristics are absent in female individuals. However, wings of teneral males some time are hyaline. They inhabit in unshaded dust still waters (ground pools) in lowland forests. They fly weakly and hide in bushes or vegetations above water surface about 1-2m high.
Male in dorsal view, photographed by Cuong Do, Cat Tien National Park, Dong Nai Province
Male in lateral view, photographed by Cuong Do, Cat Tien National Park, Dong Nai Province