| Fusaria depressa Zeder, 1800 |
| Hexametra Travassos, 1919 |
| Hexametra boddaertii (Baird, 1860) Kreis, 1944 |
| Hexametra chamelensis Caballero-Deloya, 1981 |
| Lagochilascaris Leiper, 1909 |
| Lagochilascaris minor Leiper, 1910 |
| Multicaecinae Hartwich, 1954 |
| Ophidascaridini Hartwich, 1954 |
| Ophidascaridinii Hartwich, 1954 |
| Ophidascaris Baylis, 1921 |
| Ophidascaris ashi Sprent, 1988 |
| Ophidascaris labiatopapillosa Walton, 1927 |
| Ophidascaris ochoterenai Caballero, 1939 |
| Parascaris Yorke & Maplestone, 1926 |
| Parascaris equorum (Goeze, 1782) Yorke & Maplestone, 1926 |
| Porrocaecum Railliet & Henry, 1912 |
| Porrocaecum caballeroi Caballero-Deloya, 1973 |
| Porrocaecum crocodili Taylor, 1924 |
| Porrocaecum depressum (Zeder, 1800) Baylis, 1920 |
| Toxascaris Leiper, 1907 |