New Australian Species of Ampeliscidae (Crustacea: Amphipoda) from the Great Barrier Reef and Eastern Australia with a Key to Australian Species Author Poore, Gary C. B. Museums Victoria, GPO Box 666, Melbourne VIC 3001, Australia Author Lowry, James K. Australian Museum Research Institute, Australian Museum, 1 William Street, Sydney NSW 2010, Australia (deceased 4 November 2021) text Records of the Australian Museum 2023 Rec. Aust. Mus. 2023-12-06 75 4 519 533 http://dx.doi.org/10.3853/j.2201-4349.75.2023.1890 journal article 293316 10.3853/j.2201-4349.75.2023.1890 5601d427-083c-4543-af69-74b4b13f51d7 2201-4349 10413670 8580D095-3E88-4FB5-B2D6-5DA6755BB16A Ampelisca katoomba sp. nov. urn:lsid:zoobank. org:act: 06D290FB-969E-4E1E-BE56-406D48286398 Fig. 3 Holotype : AM P.85993, female (carcass lost, 4 microscope slides present, length unknown). Australia , New South Wales , E of Wollongong , 34°24'S 151°19'E , 278 m , 13 Dec 1978 (stn K78-27-08). Description of holotype . Head. Head 1.2 times as long as deep; anteroventral margin oblique, at 45 degrees; eyes present, with 2 pairs with cuticular lenses. Antenna 1 short, much shorter than peduncle of antenna 2 (reaching midlength of antenna 2 article 5); peduncular article 2 1.5 times length of article 1. Mandible palp article 2 tapering distally. Figure 3 . Ampelisca katoomba sp. nov. , holotype, female, AM P.85993. Pereon. Coxae 1–3 each with small posteroventral hooks. Gnathopod 1 coxa anterior margin straight, anteroventral corner not produced. Pereopod 4 merus 2.8 times as long as wide, with setose margins; dactylus twice as long as propodus. Pereopod 6 basis anterior margin with prominent rounded angle, with 2 long, plumose setae; ischium-dactylus 1.6 times as long as basis. Pereopod 7 basis distal margin reaching half-length of ischium, transverse, distal margin densely setose; ischium longer than merus; merus anterior lobe slightly produced along anterior margin of carpus; carpus short (about as long as broad), carpus anterior lobe overlapping one-quarter length of propodus; propodus inflated; dactylus lanceolate. Pleon. Epimeron 1 with anteroventral hooked seta. Epimeron 2 posteroventral corner with small tubercle. Epimeron 3 ventral margin convex, posteroventral corner with small sharp triangular tooth under straight posterior margin. Urosomite 1 with prominent asymmetrical carina. Urosomites 2–3 dorsal margin with high triangular crest having low anterior elevation. Uropod 1 reaching beyond base of uropod 2 rami. Uropod 2 inner ramus upper margin with 6 short robust setae, lower margin with 2 robust setae; outer ramus with 1 long subterminal robust seta, upper margin with 2 short robust setae, outer margin with 6 short robust setae. Uropod 3 inner ramus broadly lanceolate, upper margin with 1 seta, lower margin with distal setae; outer ramus 3 times as long as wide, distal upper margin with 12 long, plumose setae. Telson 1.25 times as long as wide, deeply cleft (70%), lateral margins evenly convex, with sublateral ridge bearing few setae; with pair of posterior triangular teeth separated from lateral margins by shallow notches bearing 2 pairs of subapical setae. Distribution . Australia , New South Wales , slope, 278 m (known only from type locality). Remarks . Ampelisca katoomba sp. nov. from the New South Wales slope was not included in the list of species from southeastern Australia described by Lowry & Poore (1985) . Following their key to species leads to A. australis Haswell, 1879 , which differs in having antenna 1 reaching the end of article 4 of antenna 2 (exceeding this point in A. katoomba sp. nov. ), much longer tooth below a convex posterior margin on epimeron 3 (small tooth, straight posterior margin), a longer distal margin on the basis of pereopod 7 (more rounded posterodistally) and a prominent keel on fused urosomites 2–3. Such a urosomite keel is unique among Australian species.