| Genus | Prostheceraeus |
| Species | giesbrechtii |
| Authority | Schmarda, 1859 |
| Family | Euryleptidae |
| Order | Polycladida |
| Location | Porto Santo Island (near Madeira) |
| © Copyright | Prof. Dr. Peter Wirtz,
University of Madeira, Portugal |
| Comments | P. giesbrechtii is one of the most common flatworm species of the Mediterranean Sea and can also be found in the temperate Eastern Atlantic. |