Icilius danae Stebbing, 1888

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 : 483-485

Icilius danae Stebbing, 1888

( Fig. 12 )

Icilius danae Stebbing, 1888: 1202 , pl. 133; 1910: 625, pl. 59a; Barnard, 1969: 427, fig. 156i (after Stebbing, 1910); Barnard & Karaman, 1991: 375, fig 73.

Icilius ovalis - Della Valle, 1893: 345 (part); Stebbing, 1906: 707 (part).

Icilius australis - Barnard & Karaman, 1991: 376, fig. 73 (after Stebbing, 1888), 658, fig. 119c (after Stebbing, 1910).

Type material. – Holotype - female, BMNH 1889.5 .15.155.

Material examined. – Queensland: 1 ex., AM P27293 , east of Lady Elliot Island , 24º00’S 153º06’E, fine grey ooze, sand with pteropod shells, 500 m, HMAS Kimbla , coll. P. Colman & F. Rowe, 17 Nov.1977 . New South Wales: 19 ex., AM P2540 , 6.5-10.5 km off Manning River , 31º57’S 152º46’E, fine grey sand, 40 m, E. R. Waite on HMCS Thetis , 5 Mar.1898 . 1 ex., AM P54305 , Cape Banks , 34º00’S 151º16’E, 50 m, coll. The Ecology Lab, 29 Oct.1990 . 1 ex., AM P54378 , 30 m ; 3 ex., AM P54369 , 40 m ; 1 ex., AM P54315 , 40 m ; 2 ex., AM P54297 , 40 m ; 1 ex., AM P54367 , 50 m ; 2 ex., AM P54381 , 50 m ; 1 ex., AM P54371 , 50 m ; 6 ex., AM P54361 , 50 m ; 2 ex., AM P54363 , 50 m ; 1 ex., AM P54298 , 50 m ; 1 ex., AM P54359 , 70 m; Cobblers ( Bate Bay ), 34º07’S 151º10’E, coll. The Ecology Lab, 24 Jan.1990 to 3 Jan.1991. 1 ex., AM P46421 , 40 m ; 1 ex., AM P54301 , 40 m ; 2 ex., AM P54364 , 40 m ; 1 ex., AM P54299 , 50 m ; 5 ex., AM P54300 , 50 m ; 3 ex., AM P54302 , 50 m ; 1 ex., AM P54384 , 50 m ; 1 ex., AM P54376 , 50 m ; 2 ex., AM P54356 , 50 m ; 1 ex., AM P54386 , 70 m ; 1 ex., AM P54360 , 70 m ; 1 ex., AM P54365 , 70 m ; 1 ex., AM P54357 , east of Providential Head, Wattamolla , 34º08’S 151º08.5’E, 70 m, coll. The Ecology Lab, 11 Jan.1990 to 3 Jan.1991. 1 ex., AM P2541 ; 1 ex., AM P2542 , 5.5-6.5 km off Wattamolla , 34º10’S 151º11’E, mud, 108 m, E. R. Waite on HMCS Thetis , 22 Mar.1898 . 1 ex., AM P54379 , 40 m ; 5 ex., AM P54366 , 40 m ; 1 ex., AM P54374 , 40 m ; 2 ex., AM P54375 , 50 m ; 5 ex., AM P54380 , 50 m ; 2 ex., AM P54370 , 50 m ; 1 ex., AM P54372 , 50 m ; 4 ex., AM P54373 , 50 m ; 2 ex., AM P54303 , 50 m ; 1 ex., AM P54358 , 50 m ; 1 ex., AM P54377 , 50 m ; 2 ex., AM P54382 , 50 m ; 1 ex., AM P54368 , 70 m ; 1 ex., AM P54304 , 70 m ; 1 ex., AM P54362 , 70 m ; 1 ex., AM P54306 , 70 m ; 1 ex., AM P54311 , 70 m ; 3 ex., AM P54312 , 70 m ; 3 ex., AM P54313 , 70 m ; 4 ex., AM P54314 , 70 m ; 1 ex., AM P54383 , 70 m ; 1 ex., AM P54385 , Bass Point , 34º36’S 150º54’E, 70 m, The Ecology Lab, 25 Jun.1990 to 3 Jan.1991. Victoria: More than 20 ex., NMV J44954 , South of Point Hicks , 38º17.70’S, 149º11.30’E, 400 m, coarse sand, gravel, mud, many sponges, WHOI epibenthic sled, coll. M.F. Gomon et al. on RV Franklin, 24 Jul.1986 . 1 ex., NMV J44956 , South of Point Hicks , 38º14.80’S, 149º9.30’E, 200 m, coarse sand, gravel, WHOI epibenthic sled, coll. M.F. Gomon et al. on RV Franklin, 24 Jul.1986 . 1 ex., NMV J26800 , 15.5 km southwest of Point Ricardo, Eastern Bass Strait , 37º53.14’S, 148º28.94’E, 45 m, medium sand, Smith-McIntyre grab, coll. N. Coleman on RV Sarda, Feb.1991 . 1 ex., NMV J26864 , 13.1 km east of eastern edge of Lake Tyers, Eastern Bass Strait , 37º49.90’S, 148º14.00’E, 21 m, coarse sand, Smith-McIntyre grab, coll. N. Coleman on RV Sarda, Feb.1991 . 2 ex., NMV J44959 , 8 km south of South East Point, Wilsons Promontory, Eastern Bass Strait , 39º12.9’S, 146º27.3’E, 65 m, coll. R. S. Wilson on RV Tangaroa , 18 Nov.1981 . 3 ex., NMV J44935 , 57 km south of Rodondo Island, Central Bass Strait , 39º43.5’S, 146º18.8’E, 80 m, coll. R. S. Wilson on RV Tangaroa , 13 Nov.1981 . About 13 ex., NMV J44952 , 45 km south southwest of Cape Otway, Western Bass Strait , 39º15’S, 143º19’E, 94 m, coarse sand, carbonate, Smith-McIntyre grab/pipe dredge, coll. G.C.B. Poore on HMAS Kimbla , 10 Oct.1980 . Tasmania: 16 ex., NMV J2438 63 km east of North Point, Flinders Island, Eastern Bass Strait , 39º44.8’S, 148º40.6’E, 124 m, fine sand, WHOI epibenthic sled, coll. R. S. Wilson, RV Tangaroa , 14 Nov.1981 . 1 ex., NMV J2437 , 42 km southwest of Babel Island, Eastern Bass Strait , 40º13.8’S, 148º39.6’E, 60 m, muddy sand, WHOI epibenthic sled, coll. R. S. Wilson on RV Tangaroa , 14 Nov.1981 . More than 10 ex., NMV J44953 , 60 km east of North Point, Flinders Island , Eastern Bass Strait , 39º41.7’S, 148º39.5’E, 115 m, muddy sand, naturalist’s dredge, coll. G.C.B. Poore on HMAS Kimbla , 27 Mar.1979 . More than 20 ex., NMV J44960 , 60 km east of North Point, Flinders Island , Eastern Bass Strait , 39º41.7’S, 148º39.5’E, 115 m, muddy sand, naturalist’s dredge, coll. G.C.B. Poore on HMAS Kimbla , 27 Mar.1979 . 1 ex., NMV J44948 , 15 km east of Maria Island, Tasman Sea , 42º37’S, 148º20’E, 102 m, WHOI epibenthic sled, coll. R. S. Wilson on RV Soela, 9 Oct.1984 . 1 ex., NMV J44942 , 25 km southwest of Cape Frankland, Flinders Island, Central Bass Strait , 40º09.4’S, 147º32.6’E, 51 m, coll. R. S. Wilson on RV Tangaroa , 14 Nov.1981 . 1 ex., NMV J44947 , 30 km north northwest of Cape Sorell , 42º10.9’S, 144º48.9’E, 160 m, WHOI epibenthic sled, coll. R. S. Wilson on RV Soela, 20 Oct.1984 . 3ex., NMV J2439 , 35 km east of Cape Farewell, King Island, Central Bass Strait , 39º32.8’S, 144º21’E, 27 m, fine sand, WHOI epibenthic sled, coll. M.F. Gomon & G.C.B. Poore, RV Sarda , 1 Nov.1980 . 3 ex., NMV J44941 , 35 km north of Cape Wickham, King Island Central Bass Strait , 39º13.6’S, 143º55.6’E, 85 m, fine sand, Epibenthic Sled, coll. R. S. Wilson on RV Tangaroa , 23 Nov.1981 . 2 ex., NMV J44933 , 70 km west of Cape Farewell, King Island, Western Bass Strait , 39º38.2’S, 143º07.2’E, 127 m, coll. R. S. Wilson on RV Tangaroa , 21 Nov.1981 . Tasmania: 6 ex., AM P54203 , north side of Esperance Point, D’Entrecasteaux Channel , Tasmania, Australia, 43º19.5’S 147º5.5’E, 13 m, coll. J. K. Lowry & S.J. Keable on the Flying Scud, 18 Apr.1991 .

Type locality. – Off Melbourne, Victoria, 38º22´30’’S 144º36´30’’E, Challenger Station 161 .

Description. – (based on Stebbing, 1888: 1202, pl. 132). Head length 2 x width; rostrum rounded. Antenna 1 shorter than antenna 2; peduncular article 1 subequal to (1 x) article 2; accessory flagellum present, accessory flagellum 1-articulate; flagellum 13+ articles. Antenna 2 flagellum 38+ articles. Mandible left incisor with 7 serrations, right incisor with 7 serrations or 8 serrations; accessory setal rows: left with 8 setae, right with 6 setae; palp article 2 slender, length 6.3 x breadth, 1.5 x article 3; article 3 slender, straight, not distally falcate. Upper lip apically notched, setose. Lower lip inner lobes present; outer lobes entire; mandibular lobes rounded apically. Maxilla 1 inner plate with 4 apical pappose setae; palp with 9 apical robust setae and many subapical slender setae.

Pereon. Pereonite 7 posterodorsal margin with mid-dorsal spine, without setae along posterior margin. Gnathopods 1 and 2 not sexually dimorphic; simple with long, slender setae along posterior margin. Gnathopod 1 basis 0.56 x carpus length; carpus 1.2 x propodal length. Gnathopod 2 basis 0.56 x carpal length; carpus 1.1 x propodal length. Pereopods 3– 4 sexually dimorphic; pereopods 3–4 similar in size to pereopods 5–6; weakly prehensile; basis without midmedial row of vertical pappose setae, without submarginal row of robust setae, with marginal row of pappose setae. Pereopod 3 carpus length 3.3 x breadth; propodus length 5.3 x breadth, 1.6 x carpal length, with 2 rows of posterodistal robust setae. Pereopod 7 posteroventral corner bicuspidate, outer cusp much longer than inner.

Pleon. Pleonite 1 posterodorsal margin with mid-dorsal spine, 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 long, more than 2 x length of urosomite 2. Uropod 1 outer ramus 0.65 x inner ramus. Uropod 2 outer ramus 0.6 x inner ramus. Uropod 3 peduncle with well developed distomedial flange. Telson as long as broad, rounded distally, without apical setae.

Figures

Fig. 12. Icilius danae Stebbing, 1888: female holotype BMNH 1889.5.15.155, off Melbourne, Vic., Australia. After Stebbing, 1888, plate 133.