| Singular | Plural | |
|---|---|---|
| Nominativ | cynacantha | cynacanthae |
| Genitiv | cynacanthae, cynacanthai | cynacantharum, cynacanthum |
| Dativ | cynacanthae, cynacanthai | cynacanthis, cynacanthabus |
| Akkusativ | cynacantham | cynacanthas |
| Ablativ | cynacantha, cynacanthad | cynacanthis, cynacanthabus |
| Vokativ | cynacantha | cynacanthae |