Colour in preservative. Similar to that of fresh condition except as noted below. Upper half of body including
head dark grey. Lower half of body including head pale white except anterior half of body nearly greyish white. All
turquoise, yellowish, silverly bluish, pinkish orange and snowy whitish colors lost (Fig. 2b, c).
Comparisons. In general, O. krongnoensis most resembles O. leptura and O. gerlachi when compared with
congeners in the Mekong basin and Red river basin. Onychostoma krongnoensis differs from O. leptura in having
scales in transverse row 7/1/5 vs. 7/1/4, predorsal scales 14−17 vs. 12−13, eye small with diameter 17.8−21.9 vs.