| Synonymous name | : | †Trionyx affinis Negri, 1892 | |
Ref: PBDB: 27 Dec 2017. |
| Synonymous name | : | †Trionyx capellinii conjugens Sacco, 1894 | |
Ref: PBDB: 29 Dec 2017. |
| Synonymous name | : | †Trionyx capellinii gracilina (Sacco, 1895) | |
Ref: PBDB: 29 Dec 2017. |
| Synonymous name | : | †Trionyx capellinii montevialensis (Negri, 1892) | |
Ref: PBDB: 29 Dec 2017. |
| Synonymous name | : | †Trionyx capellinii perexpansa Sacco, 1895 | |
Ref: PBDB: 29 Dec 2017. |
| Synonymous name | : | †Trionyx gemmellaroi Negri, 1892 | |
Ref: PBDB: 27 Dec 2017. |
| Synonymous name | : | †Trionyx insolitus Bergounioux, 1954 | |
Ref: PBDB: 20 Feb 2018. |
| Synonymous name | : | †Trionyx intermedius Bergounioux, 1954 | |
Ref: PBDB: 27 Dec 2017. |
| Synonymous name | : | †Trionyx schaurothianus (Negri, 1893) | |
Ref: PBDB: 27 Dec 2017. |