n = 10
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Guyanancistrus brevispinis | (Heitmans, Nijssen & Isbrücker, 1983) | Guyanancistrus brevispinis | Loricariidae | |
| Guyanancistrus brownsbergensis | Mol, Fisch-Muller & Covain, 2018 | Guyanancistrus brownsbergensis | Loricariidae | |
| Guyanancistrus longispinis | (Heitmans, Nijssen & Isbrücker, 1983) | Pseudancistrus longispinis | Loricariidae | |
| Guyanancistrus megastictus | Fisch-Muller, Mol & Covain, 2018 | Guyanancistrus megastictus | Loricariidae | |
| Guyanancistrus nassauensis | Mol, Fisch-Muller & Covain, 2018 | Guyanancistrus nassauensis | Loricariidae | |
| Guyanancistrus niger | (Norman, 1926) | Pseudancistrus niger | Loricariidae | |
| Guyanancistrus schomburgkii | (Günther, 1864) | Lasiancistrus schomburgkii | Loricariidae | |
| Guyanancistrus tenuis | Fisch-Muller, Mol & Covain, 2018 | Guyanancistrus tenuis | Loricariidae | |
| Guyanancistrus teretirostris | Fisch-Muller, Mol & Covain, 2018 | Guyanancistrus teretirostris | Loricariidae | |
| Guyanancistrus trinitatis | (Günther, 1864) | Ancistrus trinitatis | Loricariidae |