Macrobrachium malcolmsonii (Milne Edwards, 1844)

Rostrum with distinct elevated basal crest.

Distinctive characters : Rostrum rather long, reachingto about end of antjn-nal scale, its tip slightly upcurved basal part of dorsal margin rather high and crest-like, armed with 7-11 teeth of which he posterior 2 or 3 are placed behind with the orbital margin, distal part of dorsal margin toothless, except for 1 or 2 (sometimes upto 4) subdistal teeth, ventral margin with 4 to 7, usually 6, teeth.

Colour : Pale greenish to pale greyish