Archiv für Molluskenkunde 147 (1) 1–48 Frankfurt am Main, 29 June 2018 Results of the Rumphius Biohistorical Expedition to Ambon (1990). Part 17. The Cephalaspidea, Anaspidea, Pleurobranchida, and Sacoglossa (Mollusca: Gastropoda: Heterobranchia) Nathalie Yonow1 & Kathe R. Jensen2 1 Swansea Ecology Research Team, Department of Biosciences, Swansea University, Singleton Park, Swansea SA2 8PP, Wales, United Kingdom ([email protected]). 2 Zoological Museum, Universitetsparken 15, DK-2100 Copenhagen, Denmark. • Corresponding author: N. Yonow. Abstract. This is the final report describing the heterobranch molluscs collected by the Rumphius Bio historical Expedition to Ambon during November and December 1990. This part deals with the non‑nudibranch higher clades (Cephalaspidea, Anaspidea, Sacoglossa, and Pleurobranchida). Forty‑one species belonging to 21 genera are identified from Ambon and nearby localities in the central Indonesian archipelago; 2 species are new to science, and 3 species are new records for Indonesia. The new species Haminoea edmundsi is described from the mangroves near Paso in Ambon Bay, and the new species Mourgona anisti is described from Latuhalat, also Ambon. A discussion and table of all named species of Plakobranchus are provided, and the original descriptions and museum specimens from other localities are compared in an effort to clarify some of the problems surrounding these species. Chelidonura sandrana Rudman, 1973 and C. babai Gosliner, 1988 are synonymised with C. tsurugensis Baba & Abe, 1959. Recent corrections of names and/or dates of publication are highlighted: Phanerophthalmus olivaceus (Ehrenberg, 1828), Aplysia argus Rüppell & Leuckart, 1830, Dolabella auricularia ([Lightfoot], 1786), Elysia faustula Bergh, 1871, Cyerce elegans Bergh, 1870, Euselenops luniceps (Cuvier, 1816), and Pleurobranchus peronii Cuvier, 1804. Key words. Biogeography, Indonesia, taxonomy, Anaspidea, Cephalaspidea, Pleurobranchida, Sacoglossa. DOI. https://doi.org/10.1127/arch.moll/147/001‑048 Contents Introduction ......................................... 2 Anaspidea Materials and Methods ................................. 2 Family Aplysiidae Taxonomic Report ..................................... 3 Aplysia argus Rüppell & Leuckart, 1830 ............... 9 “Lower Heterobranchia” Aplysia parvula Mörch, 1863 ....................... 10 Family Aplustridae Aplysia sp. 10 Hydatina physis (Linnaeus, 1758) . 3 Dolabella auricularia ([Lightfoot], 1876) ............. 10 Cephalaspidea Petalifera cf. pasirana (Bergh, 1905) . 11 Family Haminoeidae Stylocheilus longicauda (Quoy & Gaimard, 1824) ....... 12 Haminoea edmundsi sp. nov. 3 Pleurobranchida Phanerophthalmus olivaceus (Ehrenberg, 1828) ......... 4 Family Pleurobranchidae Smaragdinella calyculata (Broderip & Sowerby, 1829) .... 5 Berthellina citrina (Rüppell & Leuckart, 1828) ......... 12 Family Bullidae Bulla ampulla Linnaeus, 1758 ....................... 5 Pleurobranchus albiguttatus (Bergh, 1905) ............ 13 Family Aglajidae Pleurobranchus peronii Cuvier, 1804 . 14 Chelidonura amoena Bergh, 1905. 6 Family Pleurobranchaeidae Chelidonura electra Rudman, 1970. 6 Euselenops luniceps (Cuvier, 1816) .................. 14 Chelidonura inornata Baba, 1949 ..................... 7 Sacoglossa Chelidonura tsurugensis Baba & Abe, 1959 . 8 Family Juliidae Chelidonura sp. 9 Julia exquisita Gould, 1862 ........................ 15 Philinopsis gardineri (Eliot, 1903) . 9 Julia zebra Kawaguti, 1981. 16 © E. Schweizerbart’sche Verlagsbuchhandlung (Nägele u. Obermiller) and Senckenberg Gesellschaft für Naturforschung, 2018, ISSN 1869-0963.