Drepane longimana was first formally described as Chaetodon longimanus in 1801 by the German naturalists Marcus Elieser Bloch and Johann Gottlob Theaenus Schneider with its type locality given as Tranquebar in India.

[4] Drepane longimana has an oval shaped, strongly compressed body with a depth of 120% to 130% of its standard length.

It has a highly protrusible mouth and forms a ventrally facing tube when extended.

[1] Drepane longimana is found in the Indo-Pacific from the Red Sea and eastern coast of Africa east to New Guinea and northern Australia and north to Taiwan and Japan.

[1] The concertinafish is found in coastal areas over sand and mud substrates in reefs, harbours and estuaries.