Name(s) in cluster
| Ptychodus latissimus | urn:lsid:organismnames.com:name:1750732 |
| Ptychodus latissimus U. | urn:lsid:organismnames.com:name:2539256 |
| Ptychodus latissimus Ag. | urn:lsid:organismnames.com:name:3874308 |
| Ptychodus latissimus Agassiz 1843 | urn:lsid:organismnames.com:name:4372141 |
| Ptychodus latissimus Agassiz 1835 | urn:lsid:organismnames.com:name:4940766 |
...