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 Byblis liena sp. nov. urn:lsid:zoobank.org:act: 5652539D-2DC2-4C7A-9BC5-75B555BBD9F6 Fig. 6 Holotype : AM P.27290, female, length unknown. Australia , Queensland , E of Lady Elliot Island , 24°00'S 153°06'30"E , 475–530 m , Australian Museum party, 17 Nov 1977 , fine grey ooze, sand with pteropod shells (HMAS Kimbla stn 1). Description of holotype . Head. Head 1.4 times as long as deep; rostrum one-fifth length of head, rounded; anteroventral margin with antennal lobe, oblique; eyes weakly pigmented, without cuticular lenses. Antenna 1 peduncular article 2 2.3 times as long as article 1; article 3 about one-third length of article 2; flagellum of 20 articles; almost as long as antenna 2. Pereon. Coxae 1–3 rounded, coxa 1 with setose margin. Pereopods 3, 4 dactylus as long as propodus. Pereopod 5 basis flexor margin with prominent proximal lobe; extensor margin without plumose setae. Pereopod 6 basis subcircular, extensor margin with 11 plumose setae. Pereopod 7 basis posterodistal margin truncate-rounded, reaching almost to distal end of carpus, free anterior margin setose near junction with ischium; merus longer than wide, widest distally; carpus 1.5 times as long as wide, as long as ischium-merus together; propodus linear, 3 times as long as wide. Pleon. Epimeron 3 posteroventral margin broadly rounded. Uropod 1 outer ramus with 4 short robust setae; inner ramus shorter, with 3 short robust setae. Uropod 2 inner ramus rami subequal; each ramus upper margin with 1 robust seta. Uropod 3 rami equal, inner ramus with 2 robust setae. Telson 1.3 times as long as wide, subtriangular, cleft about one-third of length, with pair of long dorsal robust setae; distal margin narrow, bilobed. Distribution . Australia , southeastern Qld, slope, 475–530 m (known only from type locality). Figure 6 . Byblis liena sp. nov. , holotype, female, AM P.27290. Remarks . Byblis liena sp. nov. lack cuticular lenses and the eye is weakly pigmented. The species shares with B. tinamba Poore & Lowry, 1985 in Australia antennae of similar lengths but differs, inter alia, in the shape of the basis of pereopod 7, a more triangular telson and a much longer uropod 3. The triangular telson is unusual but something similar is seen in B. laterocostatus Ren, 2006 from China .