| Singular | Plural | |
|---|---|---|
| Nominativ | cantharus | canthari, cantharideis |
| Genitiv | canthari, cantharideis | cantharorum |
| Dativ | cantharo, cantharoque | cantharis |
| Akkusativ | cantharum, cantharom | cantharos |
| Ablativ | cantharoque, cantharo | cantharis |
| Vokativ | canthare | canthari, cantharideis |