Biodiversity in the Mediterranean Sea has not yet been fully explored. There has been very little research on molluscs along the Libyan coast. An individual of the chromodoridid nudibranch ( ) was encountered during scuba diving at the Lido resort near the Tobruk bay basin. The sample was carefully transported to the lab in seawater, photographed, and identified. The current study revealed that was recorded for the first time on the Libyan coast. Despite being rather common in many Mediterranean regions, records of it on the southern Mediterranean coasts are extremely rare or absent. It may be concluded that this study represents not only the southernmost record of in the Mediterranean but also the first record of the species in Libya.