Bull. Soc. Nat. luxemb. 108 (2007) 89 1. Introduction Wallis and Futuna is a small archipelago located in the South Pacifc Ocean, west of Samoa and north-east of Fiji (fg. 1). Te archipelago is part of the so-called Pacifc Islands, which together with Australia and New Zealand form the geographic region commonly designated as Oceania. In October 2004 one of us (NMS) carried out an extensive survey of the freshwater habitats of Futuna and Wallis. Tat investi- gation aimed at improving the knowledge of the fora, the fauna and the environmental conditions of the freshwater ecosystems of the two islands. In the present contribution we present the Ostracoda (Crustacea) col- lected in the course of that survey. No freshwater ostracods had formerly been reported from the islands of Futuna and Wallis. Indeed, the record of Hemicypris futunaensis Victor & Fernando, 1978, which was collected from “a large hole in a lump of coral, Mission Bay, Futuna, New Hebrides” (Victor & Fernando 1978) comes from a diferent island. Tat other island of Futuna, sometimes called West Futuna to distinguish it from the French Futuna, is part of the Republic of Vanuatu (the Vanuatu archipelago was designated as Te New Hebrides before acquiring its inde- pendence in 1980). While the marine ostracods from the Pacifc Islands are relatively well known, only a rel- atively small number of publications deals with their non-marine fauna (see references in table 4). Hartmann (1984) was the frst to publish a check-list of both marine and non-marine ostracods known from the Pacifc Islands. Hartmann’s (op. cit.) list comprised 20 non- marine ostracod species. More recently, Eldredge & Miller (1997) pro- vided a list of the freshwater invertebrates, the ostracods included, of Hawaii, while Colin Freshwater Ostracoda (Crustacea) collected from the islands of Futuna and Wallis, Paci fc Ocean, with a check- list of the non-marine Ostracoda of the Paci fc Islands Claude Meisch 1 , Nathalie Mary-Sasal 2 , Jean-Paul Colin 3 & Karel Wouters 4 1 Musée national d’histoire naturelle, 25, rue Munster, L-2160 Luxembourg (claude.meisch@education.lu) 2 27, avenue du Maréchal Jofre, F-66200 Corneilla del Vercol (nmary@free.fr) 3 3, impasse des Biroulayres, F-33610 Cestas (jean-paul.colin@worldonline.fr) 4 Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels (karel.wouters@naturalsciences.be) Meisch, C., N. Mary-Sasal, J.-P. Colin & K. Wouters, 2007. Freshwater Ostracoda (Crustacea) collected from the islands of Futuna and Wallis, Pacifc Ocean, with a check-list of the non- marine Ostracoda of the Pacifc Islands. Bulletin de la Société des naturalistes luxembourgeois 108: 89-103. Abstract. Te freshwater Ostracoda collected during a survey carried out in October 2004 on the French islands of Futuna and Wallis, Polynesia, Pacifc Ocean, are presented. In total, 10 species were found, of which 5 could be identifed to the species level. Notes on the taxonomy of the species are provided. Parastenocypris perarmata (Brady, 1904) McKenzie, 1971 is transferred into the genus Chrissia Hartmann, 1957: Chrissia perarmata (Brady, 1904) comb. nov. Scanning electron micrographs of Strandesia vinciguerrae (Masi, 1905) and Cypretta seurati Gauthier, 1929 are presented. A check-list of the non-marine Ostracoda of the Pacifc Islands (Oceania minus Australia and New Zealand) is given. Key words. Ostracoda, Crustacea, Pacifc Islands, Polynesia, Futuna, Wallis, freshwater, non-marine.