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