Byblis liena, Poore & Lowry, 2023

Poore, Gary C. B. & Lowry, James K., 2023, New Australian Species of Ampeliscidae (Crustacea: Amphipoda) from the Great Barrier Reef and Eastern Australia with a Key to Australian Species, Records of the Australian Museum (Rec. Aust. Mus.) 75 (4), pp. 519-533 : 528-529

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).

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.

Figures

Figure 6. Byblis liena sp. nov., holotype, female, AM P.27290.