| Cyclocoelidae Stossich, 1902 |
| Cyclocoelinae Stossich, 1902 |
| Cyclocoelum Brandes, 1892 |
| Cyclocoelum halli Harrah, 1922 |
| Cyclocoelum leidyi Harrah, 1922 |
| Cyclocoelum mutabile (Zeder, 1800) Brandes, 1892 |
| Cyclocoelum pseudomicrostomum Harrah, 1922 |
| Haematotrephinae Dollfus, 1948 |
| Haematotrephus Stossich, 1902 |
| Haematotrephus halli (Harrah, 1922) Macko & Feige, 1960 |
| Harrahium Witenberg, 1926 |
| Harrahium halli (Harrah, 1922) Witenberg, 1926 |
| Neohaematotrephus Kanev, Radev & Fried, 2002 |
| Neohaematotrephus arayae Zamparo, Brooks, Causey & Rodríguez, 2003 |
| Selfcoelum Dronen, Gardner & Jiménez, 2006 |
| Selfcoelum lamothei Blend & Dronen, 2008 |