| Oaxa albiclava Boucek, 1993 |
| Oluspa Cameron, 1913 |
| Otitesellinae Joseph, 1964 |
| Pachricrepoideus Ashmead, 1904 |
| Pachricrepoideus elongata Delucchi, 1956 |
| Pachyceras Ratzeburg, 1844 |
| Pachyceras xylophagorum Ratzeburg, 1844 |
| Pachychrepoideus Ashmead, 1904 |
| Pachychrepoideus dubius Ashmead, 1904 |
| Pachycrepoideus Ashmead, 1904 |
| Pachycrepoideus crassinervis (Boucek, 1954) |
| Pachycrepoideus dissimilis (Girault & Dodd, 1915) |
| Pachycrepoideus drosophilae Dodd, 1917 |
| Pachycrepoideus dubius Ashmead, 1904 |
| Pachycrepoideus elongata Delucchi, 1955 |
| Pachycrepoideus elongatus Delucchi, 1955 |
| Pachycrepoideus niger (Girault, 1915) |
| Pachycrepoideus tucumanus Blanchard, 1943 |
| Pachycrepoideus vindemmiae (Rondani, 1875) |
| Pachylarthrus Westwood, 1832 |