Kryptoglanis shajii is a species of subterranean catfish found in subsurface waters in the Western Ghats in Kerala, India. This species grows to a length of 5.9 centimetres (2.3 in) SL. It is currently the only known member of its genus and family.

The morphology of K. shajii differs from all other known species of catfish and includes such features as the absence of dorsal fin; the presence of four pairs of barbels; an upwardly directed mouth, with a distinctly projecting lower jaw; subcutaneous eyes; anal fin completely confluent with the caudal fin; anal and caudal fins together carry 70–74 fin rays; and no spines in any of the fins. These differences have led to its being assigned to its own family.