The suture with smooth saddles and crenulated lobes is characteristic of the ceratitic suture, which is typically found in the order Ceratites of cephalopods
| Group I | Group II |
| P. Dissepiment | 1. Echinodermata |
| Q. Delthyrium | 2. Trilobita |
| R. Pygidium | 3. Brachiopoda |
| S. Ambulacrum | 4. Anthozoa |