A Preliminary Checklist of Marine Heterobranchs (Mollusca: Gastropoda: Heterobranchia) of SyriaAmmar, Izdihar Ali (Avtor) Nudibranchiamolluscanew recordrare speciesEastern MediterraneanThe surge in research of marine biodiversity in Syria, particularly with a focus on non-native species, along with the involvement of amateur free-diving enthusiasts, has facilitated the documentation of additional species, including Heterobranchia (Mollusca: Gastropoda). Between 2016 and 2023, several Heterobranchia species were observed by SCUBA divers along the Syrian coast at depths ranging from 2 to 12 meters. Additional specimens were manually collected on rocky shores from 2020 to 2023. In total, 16 species of Heterobranchia were identified in Syrian marine waters. Among them, 6 are non-indigenous, 2 are cryptogenic, and some are invasive. The study also highlights the presence of rare species, such as Fiona pinnata and Berthella stellata albocrossata, recorded in Syria for the first time. The prevalence of the cryptogenic species Aplysia dactylomela and the invasive Elysia grandifolia is notable across most locations.20242026-07-06 14:56:40Delo ni kategorizirano30832UDK: 5DOI: 10.19233/ASHN.2024.19slImetniki avtorskih pravic na prispevkih so avtorji. CC BY-NC 4.0