| Heligmosomidae Travassos, 1914 |
| Heligmosomoides Hall, 1916 |
| Heligmosomoides polygyrus (Dujardin, 1845) Boulenger, 1922 |
| Heligmosomum Railliet & Henry, 1909 |
| Heligmosomum brasiliense Travassos, 1914 |
| Heligmosomum vexillatum Hall, 1916 |
| Longistriata Schulz, 1926 |
| Longistriata adunca Chandler, 1932 |
| Longistriata carolinensis Dikmans, 1935 |
| Longistriata convoluta Caballero & Zerecero, 1943 |
| Longistriata dubia Bravo-Hollis, 1950 nec (Travassos, 1921) Travassos & Darriba, 1929 |
| Longistriata musculi Dickmans, 1935 |
| Longistriata vexillata (Hall, 1916) Travassos, 1937 |