| Singular | Plural | |
|---|---|---|
| Nominativ | noctiluca | noctilucae |
| Genitiv | noctilucae, noctilucai | noctilucarum, noctilucum |
| Dativ | noctilucae, noctilucai | noctilucis, noctilucabus |
| Akkusativ | noctilucam | noctilucas |
| Ablativ | noctiluca, noctilucad | noctilucis, noctilucabus |
| Vokativ | noctiluca | noctilucae |