Abstract In this paper six heterobranch mollusc species are reported for the first time Bosnia and Herzegovina: Berthellina edwardsi (Vayssiere, 1896), Felimida luteorosea (Rapp, 1827), Thuridilla hopei (Verany, 1853), Dendrodoris grandiflora Camachoaglaja africana (Pruvot-Fol, 1953) Felimare villafranca (Risso, 1818). The study was conducted in October 2021 on Klek Peninsula Neum Bay (eastern ...