Rhantus taprobanicus is a species of predaceous diving beetle found in India, Nepal, Pakistan and Sri Lanka.

[1][2][3] Reticulation of ventral side not distinct.

Elytra with more spaced normal striae of punctures.

[4] Suture between metapisternum and metasternal wing is curved.

The apical spurs of hind tibiae are blunt and more or less bifid.