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Syscenus springthorpei n.sp. is described from a single specimen taken from the southeastern Australian coast at a depth of about 500 m. This species is characterised by a sub-acute pleotelson apex, uropods that do not extend beyond the posterior margin of the pleotelson and a short antennal flagellum that does not extend beyond pereonite 3. A revised diagnosis of the genus and an annotated list of the known species is presented. BRUCE, NIEL L., 1997. A new species of Syscenus Harger, 1880 (Crustacea: Isopoda: Aegidae) from eastern Australia, with a revised diagnosis of the genus. Records of the Australian Museum 49(2): 113-120. The genus Syscenus is widely distributed throughout the world oceans. The species comprising this genus are usually known from single specimens from diverse localities. Syscenus has not previously been recorded from Australian waters and there exists only a single record from the Southwest Pacific: that of Monod (1973), which is considered of doubtful identity. The record of this genus brings the number of aegid genera known from Australian waters to four, only the Atlantic genus Xenuraega Tattersall, 1909 (Bmce 1993) and the pelagic genu; Barybrotes Schiodte & Meinert, 1879 being absent. Bmsca (1983) reviewed the history of the taxonomy of the family and Bmce (1993) provided a key to the known genera. Abbreviations used: AM-Australian Museum, Sydney; BL-body length; PMS-plumose marginal setae; PSplumose setae; ZMUC-Zoo10gisk Museum, University of Copenhagen, Denmark. Taxonomy Genus Syscenus Harger Syscenus Harger, 1880: 387.-Sars, 1899: 66.-Richardson, 1905: 212.-Stebbing, 1924: 9.-Wahrberg, 1930: 24.Nierstrasz & Schuurmans Steckhoven Jf., 1930: 77.Schultz, 1969: 196.-Menzies & George, 1972: 12.-Kussakin, 1979: 269. Harponyx Sars, 1882: 60 (type species Harponyx pranizoides Sars, 1882). Rocinela.-Bovallius, 1885: 4 (not Rocinela Leach, 1818). Syscenus.-Stephensen, 1948: 41. Type species. Syscenus infelix Harger, 1880, by monotypy. Gender neuter.