Icilius pulchellus, Watson & Lowry & Steinberg, 2004

Watson, M. J., Lowry, J. K. & Steinberg, P. D., 2004, Revision Of The Iciliidae (Crustacea: Amphipoda), Raffles Bulletin of Zoology 52 (2), pp. 467-495 : 486-490

Icilius pulchellus , new species

( Figs. 13-15 )

Material examined. – Holotype - female, AM P54148 , Burrill Rocks , New South Wales, Australia., 35º23.39’S 150º28.24’E, on the soft coral, Capnella gaboensis , 22 m, coll. A.G.B. Poore & J. K. Lowry, 1 Nov.1997.

Paratypes – 2 specimens (including 1 male), AM P54150 , 2 specimens (including 1 female), AM P54151 , Bare Island , Botany Bay, New South Wales, Australia, 33º59.6’S 151º13.9’E, on the soft coral, Capnella gaboensis , 9 m, coll. A.G.B. Poore, 4 Aug.1998 .

Others – New South Wales: 2 ex., AM P54198 , east of Long Reef , 33º44’S 151º22’E, 32 m , AMBS, 28 May.1972 . 16 ex., AM P24241 ; 13 ex., AM P22438 , east of South Head , Sydney, 33º50’S 151º18’E, on the sponge, Halme gigantea (h20002), 21 m , AMBS, Feb.1973 . 3 ex., AM P54149 , Bare Island , Botany Bay, 33º59.6’S 151º13.9’E, on the soft coral, Capnella gaboensis , 9 m, A.G.B. Poore, 4 Aug.1998 . Several ex ., AM P57896 , Bare Island , Botany Bay, 33º59.53’S 151º13.83’E, on the soft coral, Capnella gaboensis , 12 m, coll. M. J. Huggett & R. De Nys , 13 Aug.1998 . 1 ex., AM P54199 , Green Point , Jervis Bay, 35º01.0’S 150º45.2’E, unvegetated sediment, 12 m, coll. P. Hutchings & party, 17 Aug.1989 . Many ex ., AM P54387 , Jervis Bay , 35º03’S 150º44’E, sponge scallop beds, 17 m, P. Berents, 13 Aug.1981 . 9 ex., AM P54389 , Ulladulla , ‘home bommie’, 35º22’S 150º30’E, on the soft coral, Capnella gaboensis , 15 m, coll. A.G.B. Poore & J. K. Lowry, 1 Nov.1997 . 5 ex., AM P54390 , Burrill Rocks , 35º23.39’S 150º28.24’E, on the soft coral, Capnella gaboensis , 22 m, coll. A.G.B. Poore & J. K. Lowry, 1 Nov.1997 .

Type locality. – Burrill Rock , Ulladulla, New South Wales, Australia, 35º59.6’S, 151º13.9’E, living on the soft coral Capnella gaboensis , 9-30 m depth .

Description. – (based on female holotype P54148). Head length 1.4 x width; rostrum rounded. Antenna 1 shorter than antenna 2; peduncular article 1 longer than (1.6 x) article 2; accessory flagellum present, accessory flagellum 1-articulate; flagellum 29+ articles. Antenna 2 flagellum 30+ articles. Mandible left incisor with 5 serrations, right incisor with 6 serrations; accessory setal rows: left with 8 setae, right with 7 setae; molar, triturating surface well developed basally; palp article 2 broad, length 2.2 x breadth, 1.2 x article 3; article 3 broad, slightly rounded, slightly falcate distally. Upper lip apically notched, setose. Lower lip inner lobes present; outer lobes entire; mandibular lobes rounded apically. Maxilla 1 inner plate with 3 apical pappose setae; outer plate with 11 setal-teeth; palp with 8 apical robust setae and many subapical slender setae.

Pereon. Pereonite 7 posterodorsal margin with large mid-dorsal bulge, without setae along posterior margin. Gnathopods 1 and 2 not sexually dimorphic; simple with long, slender setae along posterior margin. Gnathopod 1 basis 0.79 x carpal length; carpus 0.91 x propodal length. Gnathopod 2 basis 0.83 x carpal length; carpus 0.97 x propodal length. pereopods 3–4 weakly prehensile; basis with midmedial row of vertical pappose setae, with submarginal row of robust setae, without marginal row of pappose setae. Pereopod 3 carpus length 1.58 x breadth; propodus length 3.38 x breadth, 1.58 x carpal length, with 2 rows of posterodistal robust setae. Pereopod 4 carpal length 1.92 x breadth; propodus length 3.3 x breadth, propodus 1.39 x carpal length, with 2 rows of posterodistal robust setae. Pereopod 5 coxa with rounded posteroventral corner; basis length 1.4 x breadth, basis with weakly setose posterior margin; carpus without anterodistal bump, with weakly setose posterior margin; propodus length 6 x breadth, propodus with weakly setose posterior margin. Pereopod 6 coxa with rounded posteroventral corner; basis length 1.25 x breadth, basis with weakly setose posterior margin; carpus without anterodistal bump, with weakly setose posterior margin; propodus length 5.6 x breadth, propodus with weakly setose posterior margin. Pereopod 7 coxa with rounded posteroventral corner; basis length 1.25 x breadth, basis with projecting acute posterodorsal corner, with weakly setose posterior margin, posteroventral corner bicuspidate, cusps subequal in size; carpus without anterodistal bump, with weakly setose posterior margin; propodus length 11.4 x breadth, propodus with weakly setose posterior margin.

Pleon. Pleonite 1 posterodorsal margin smooth, without spines or bulges, pleonite 1 without setae along posterior margin, posterolateral margins without spines. Pleonite 2 with mid-dorsal spine, without setae along posterior margin, posterolateral margin without spines. Pleonite 3 smooth, without spines or bulges, without setae along posterior margin, posterolateral margin without spines. Urosomite 1 short, less than 2 x length of urosomite 2. Uropod 1 outer ramus 0.78 x inner ramus. Uropod 2 outer ramus 0.67 x inner ramus. Uropod 3 peduncle with well developed distomedial flange. Telson longer than broad, tapering distally, without apical setae.

Figures

Fig. 13. Icilius pulchellus, new species: female holotype AM P54148, Ulladulla, N.S.W., Australia. Scales represent 0.2 mm.

Fig. 14. Icilius pulchellus, new species: female holotype AM P54148, Ulladulla, N.S.W., Australia. Scales for A1-2 represent 0.2 mm, remainder represent 0.1 mm.

Fig. 15. Icilius pulchellus, new species: female holotype AM P54148, G1-2, P3-4; female paratype AM P54151, P5-7; Ulladulla, N.S.W., Australia. Male paratype, AM P54150, P3-4, Bare Island, Botany Bay, Sydney, N.S.W., Australia,. Scales represent 0.2 mm.