Class Actinopterygii Woodward, 1891 - ray-finned fishes
Subclass Neopterygii Regan, 1923
Infraclass Teleostei Müller, 1845
Supercohort Teleocephala de Pinna, 1996
Clupeocephala
Cohort Euteleosteomorpha (Greenwood et al., 1966)
Subcohort Neoteleostei Nelson, 1969
Infracohort Eurypterygia (Rosen, 1973)
Section Ctenosquamata Rosen, 1973
Subsection Acanthomorphata (Rosen, 1973)
Euacanthomorpha (Johnson & Patterson, 1993)
Holacanthopterygii Johnson & Patterson, 1993
Acanthopterygii Rosen & Patterson, 1969
Euacanthopterygii
Division Percomorphacea Wiley & Johnson, 2010
Series Smegmamorpharia Johnson & Patterson, 1993
Order Synbranchiformes - swamp eels
1 Suborder Mastacembeloidei
2 Suborder Synbranchoidei