Prior to its description, G. rotundinasus was considered to represent the congener G. gravleyi, but the latter is now accepted to occur only in the Salween and Manipur river basins. These two are separated from all other Garra species in China and Southeast Asia by possession of a weakly-devel…

G. bispinosa can be distinguished from all other congeners in Southeast Asia and China by the following combination of characters: a conspicuous, quadrate, anteriorly-directed proboscis orientated ventrally against the snout and anteriorly adorned with a single, large, uniscupid, acanthoid tubercle on the distal tip of each lobe; snout with a deep groove across its tip to form a transverse lobe; 34-35 lateral…

We’ve been unable to obtain a diagnosis for this species to date but it can at least be distinguished from those congeners traded as ‘Crossocheilus siamensis’ (an invalid name synonymous with C. oblongus, which is itself of questionable identity), ‘Siamese algae eater’, or ‘SAE’ by the fact that the dark lateral stripe does not extend into the caudal-fin.

Members of Crossocheilus are characterised by…