Name(s) in cluster
| †Ptychagnostus atavus (Tullberg 1880) | urn:lsid:organismnames.com:name:436087 |
| †Ptychagnostus atavus (Tullberg ) | urn:lsid:organismnames.com:name:2023529 |
| †Ptychagnostus atavus (Tullberg 1880 sensu Whitehouse 1936) | urn:lsid:organismnames.com:name:2212653 |
| †Ptychagnostus atavus | urn:lsid:organismnames.com:name:345712 |
| †Ptychagnostus atavus (Tullb. ) | urn:lsid:organismnames.com:name:2802027 |
...