| Boreostrongylus Durette-Desset, 1971 |
| Boreostrongylus petteri Denke, 1977 |
| Boreostrongylus romerolagi Gibbons & Kumar, 1980 |
| Carolinensis Travassos, 1937 |
| Carolinensis carolinensis (Dikmans, 1935) Travassos, 1937 |
| Carolinensis huehuetlana Falcón-Ordaz & Sanabria-Espinoza, 1996 |
| Carolinensis perezponcedeleoni Jiménez, 2012 |
| Carolinensis petteri (Denke, 1977) Durette-Desset, 1983 |
| Carolinensis romerolagi (Gibbons & Kumar, 1980) Durette-Desset, 1983 |
| Hassalstrongylus Durette-Desset, 1971 |
| Hassalstrongylus aduncus (Chandler, 1932) Durette-Desset, 1972 |
| Hassalstrongylus bocqueti Denke, 1977 |
| Hassalstrongylus musculi (Dikmans, 1935) Durette-Desset, 1972 |
| Heligmonellidae Skrjabin & Schikhobalova, 1952 |
| Heligmonellinae Skrjabin & Schikhobalova, 1952 |
| Nippostrongylinae Durette-Desset, 1971 |
| Nippostrongylus Lane, 1923 |
| Nippostrongylus brasiliensis (Travassos, 1914) Lane, 1923 |
| Paraheligmonella Durette-Desset, 1971 |
| Paraheligmonella romerolagi (Gibbons & Kumar, 1980) Durette-Desset & Santos, 2000 |