Junior synonyms. Gnathophausia inflata Willemoes-Suhm, 1873.
Gnathophausia calcarata G.O. Sars, 1883.
Gnathophausia bengalensis Wood-Mason & Alcock, 1891.
Gnathophausia doryphora Illig, 1906.
Records from Indonesia. Between southern part of Sumatra water and northern Keeling Island (Illig 1930), Papua, Maluku Sea, Banda Sea, Celebes Sea, Makassar Strait, northern part of Lombok Island, southern part of Bali Island, western part of Sumatra Island (Fage 1941) and Arafura Sea (Casanova 1996). Depth range: 676–7120 m.
Remarks. This species shares a similar morphology with its ally, N. gigas, but in N. ingens both the anterior and posteroventral lobes of the pleural plates of abdominal segments 2–5 are pointed and the antennal scale is ovate or subovate, tapering into a short pointed apex (Meland & Aas 2013).