The Mirrorbelly', or barreleye, (Opisthoproctus grimaldii), is a barreleye of the genus Opisthoproctus, is found in most deep tropical and subtropical oceans and seas, from depths of 200 to 4,750 metres (660 to 15,580 ft). It grows to a length of 8 centimetres (3.1 in) SL.