Sundasalanx, the Sundaland noodlefishes, is the only genus in the family Sundasalangidae which belongs to the same order as the herrings and their relatives. This family of extremely small fishes is restricted to freshwater environments of Southeast Asia with Indonesia being home to the majority of species. The seven currently recognized species in this genus are: The FishBase classifies Sundasalanx as a pedomorphic genus within the family Clupeidae rather than as an independent family, while this is not consistent.