| Singular | Plural | |
|---|---|---|
| Nominativ | crustularius | crustularii |
| Genitiv | crustulari, crustularii | crustulariorum, crustularium |
| Dativ | crustulario | crustulariis |
| Akkusativ | crustulariom, crustularium | crustularios |
| Ablativ | crustulario | crustulariis |
| Vokativ | crustularie | crustularii |