Name(s) in cluster
| Ptychodus decurrens Agassiz 1835 | urn:lsid:organismnames.com:name:158901 |
| Ptychodus decurrens | urn:lsid:organismnames.com:name:215603 |
| Ptychodus decurrens Ag. | urn:lsid:organismnames.com:name:3760528 |
| Ptychodus decurrens Agassiz 1836 | urn:lsid:organismnames.com:name:4935075 |
...