Opal Fish (Hemerocoetes monopterygius) is a species of the class Actinopterygii (Ray-finned Fishes) in the family Percophidae (Duckbills) and order Perciformes (Perch-like Fishes).
Hemerocoetes artus
Hemerocoetes macrophthalmus
Hemerocoetes morelandi
Hemerocoetes pauciradiatus
Hemerocoetes monopterygius