| Singular | Plural | |
|---|---|---|
| Nominativ | pentecontarcus | pentecontarci |
| Genitiv | pentecontarci | pentecontarcorum, pentecontarcum |
| Dativ | pentecontarco | pentecontarcis |
| Akkusativ | pentecontarcom, pentecontarcum | pentecontarcos |
| Ablativ | pentecontarco | pentecontarcis |
| Vokativ | pentecontarce | pentecontarci |