Type locality of the holotype of Gogo ornatus: 'Madagascar: Toamasina province, Mangoro River, 200 m upstream of ferry crossing on road to Marolambo' (Ref. 56142). Known only from Mangoro River drainage on the east coast of Madagascar (Ref. 26236, 56142, 75790). Report of Ancharius brevibarbis from Mananjary River (Ref. 50351), is thought to be a misidentification of Gogo ornatus by Ng & Sparks (2005) (Ref. 56142), but it does not correspond with the distribution data in the same reference; therefore it is supposed to be an error.