- Type locality: Malaysia, Sabah, Crocker range Mountains—submontane rainforest stream surrounded by primary forest. The type material was collected below Sunsuron waterfall in ca. 4–5 m wide stream with gravel, large boulders and submerged logs.
- Holotype: NMW, ♂, 8.VI.1996, 5a.
- Etymology: The species name is from latin grandis—big, as this is the biggest known species of the genus.