Distinguished from all congeners by the presence of intense dusky markings on the dorsal and caudal fins, and from all others, except Sundadanio axelrodi and S. atomus, by the poorly developed dark lateral stripe of males. Can be further diagnosed by the following combination of characters: large body size (largest specimen examined 19.2 mm

SL); body surface dorsal to dark lateral stripe with light scattering of melanophores in preserved males; absence of secondary lateral stripe in preserved males; absence of reticulate pattern along dorsal body surface; presence of enlarged scales next to window in body musculature; complete covering of scales on caudal peduncle (Ref. 8880).

Description: Dorsal-fin ray ii.6.i; anal-fin ray iii.6; pectoral-fin ray i.6.ii; pelvic-fin ray i.5.i (Ref. 88800).