| Nominativ | castula | castulae, castule |
| Genitiv | castulai, castule, castulae | castularum, castulum |
| Dativ | castulai, castule, castulae | castulabus, castulis |
| Akkusativ | castulam | castulas |
| Ablativ | castula, castulad | castulabus, castulis |
| Vokativ | castula | castulae, castule |
