| Bulla | |
| Lip | |
| None | |
| Rimmed | |
| Umbilical teeth |
| Angular | |
| Conical | |
| Globose | |
| Hemispherical | |
| Rhomboid | |
| Spherical | |
| Subglobose | |
| Subquadrate |
| Left | |
| not applicable | |
| Right |
| Elongate | |
| Equatorial | |
| Extraumbilical | |
| Infralaminal | |
| Multiple pores/apertures | |
| Spiroumbilical | |
| Sutural | |
| Umbilical |
| Keeled | |
| Rounded |
| Microperforated | |
| Normal perforated |
| Circular | |
| No | |
| Thin | |
| Triangular | |
| Triradiate |
| Planispiral | |
| Spherical | |
| Streptospiral | |
| Trochospiral |
| 0.000 - 0.239 | |
| 0.240 - 0.500 | |
| 0.509 - 0.750 | |
| 0.759 - 1.000 | |
| 1.008 - 1.500 | |
| 1.508 - 5.000 |
| Crystaline | |
| Finely pustulose | |
| Honeycombe | |
| Medium | |
| Pustulose | |
| Rough | |
| Smooth | |
| Very smooth |