Icilius australis Haswell, 1879

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 : 472-476

Icilius australis Haswell, 1879

( Figs. 4-6 )

Icilius australis Haswell, 1879: 274 , pl. 12, fig 2; Stebbing, 1910: 628, pl. 59c.

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

not Icilius australis - Barnard & Karaman, 1991: 376, fig. 73, 658, fig. 119c (after Stebbing, 1910, = Icilius danae Stebbing, 1888 ), 658, fig. 119h (after Stebbing, 1910, = Icilius punctatus Haswell, 1879 ).

Type material. – Syntypes (probable). 4 ex., AM G5386 (Springthorpe & Lowry, 1994) .

Material examined. – New South Wales: 49 ex., AM P54396 , on the sponge, Clathria macropora with crinoids ; 30 ex., AM P54397 , on a sponge ; 105 ex., AM P54398 , on sponges ; 7 ex., AM P54399 , on a sponge; many ex., AM P54400 , on the sponge, Chondropsis sp .; 31 ex., AM P54401 , on a sponge ; 1 ex., AM P54402 , on the crinoid, Ptilometra australis ; 53 ex., AM P54403 , on a sponge ; 25 ex., AM P54404 , on the sponge, Echinoclathria sp .; 38 ex., AM P54405 , on the crinoid, Ptilometra australis , 15 m ; 8 ex., AM P54406 , on bryozoans on rocky substrate, small crinoid, Antedon incomoda , 15 m, west side of Box Head, Broken Bay, 33º33’S 151º21’E, coll. J. K. Lowry & R. T. Springthorpe , 22 Nov.1982 . 6 ex., AM P22230 , 32 m ; 7 ex., AM P22231 , 32 m ; 2 ex., AM P22232 , many ex., AM P22233 , many ex., AM P22234 , 3 ex., AM P22235 , 4 ex., AM P22236 , 21 ex., AM P22237 , 42 m, east of Long Reef , 33º44’S 151º22’E, AMBS, 2 Feb. 1973 . 6 ex., AM P22249 , 36 m, 11 May.1972 ; 10 ex., AM P22250 , east of Long Reef , 33º44’S 151º22’E, 38 m, AMBS, 24 Aug.1972 . 2 ex., AM P22248 , 43 m ; 3 ex., AM P22251 , 2 nautical miles east of Long Point, Long Reef , 33º44.54’S 151º21.30’E, 43 m, AMBS, 27 Apr.1972 . 1 ex., AM P22252 , 30 m, 25 May 1972 ; 2 ex., AM P22253 , east of North Head, Port Jackson , 33º49.5’S 151º18’E, 20 m, AMBS, 20 Sep.1972 . Many ex., AM P22240 , 27 m ; 2 ex., AM P22241 , 27 m ; 30 ex., AM P22239 , 19 m; many ex., AM P22244 , 19 m; many ex., AM P22246 , 19 m; many ex., AM P22247 , 19 m ; 2 ex., AM P22255 , 21 m; many ex., AM P22256 , 21 m ; 24 ex., AM P22242 , 21 m ; 3 ex., AM P22245 , 21 m ; 1 ex., AM P22254 , east of North Head, Port Jackson , 33º49’S 151º20’E, 21 m, Feb.1973 . 3 ex., AM P22238 , 8 ex., AM P22243 , east of North Head, Port Jackson , 33º49’S 151º21’E, 42 m, AMBS, Feb.1973 . Many ex., AM P3429 , Port Jackson , 33º51’S 151º16’E . 1 ex., AM P54154 ; 1 ex., AM P54155 ; 11 ex., AM P54160 ; Bare Island, Botany Bay , 33º59.6’S 151º13.9’E, orange sponge, 9 m, coll. A.G.B. Poore, 4 Nov.1997 . 13 ex., AM P54161 , Cape Banks, Botany Bay , 34º0.2’S 151º14.9’E, white sponge, 12 m, coll. A.G.B. Poore, 4 Nov.1997 . 2 ex., AM P54200 , Jibbon Point, Port Hacking, 34º05’S 150º22’E, sponge, rocky substrate, 15 m, coll. J. K. Lowry & R. T. Springthorpe , 13 Aug.1981 . 1 ex., AM P2545 , 5.5-6.5 km off Wattamolla , 34º10’S 151º11’E, mud, 108 m, E. R. Waite on HMCS Thetis , 22 Mar.1898 . 6 ex., AM P5925 , Shoalhaven Bight , 34º52’S 151º00’E, 82 m, FIS Endeavour, 1909- 1914 . 1 ex., AM G933 , Jervis Bay , 35º03’S 150º44’E, coll. T. Whitelegge . 1 ex., AM P54152 , on an orange sponge ; 1 ex., AM P54153 , on an orange sponge ; 7 ex., AM P54221 , on an orange sponge ; 16 ex., AM P54222 , on a red sponge ; 5 ex., AM P54388 , on an orange sponge; Burrill Rocks , 35º23.39’S 150º28.24’E, 22 m, coll. A.G.B. Poore & J. K. Lowry, 2 Nov.1997 . 1 ex., AM P54201 , east of Snapper Point, near Kiola, 35º34.5’S 150º22’E, on the gorgonacean Mopsella sp. , 20 m, coll. J. K. Lowry & R. T. Springthorpe , 26 Apr.1981 . 3 ex., AM P52776 , Merimbula Wharf, Merimbula, 36º53.92’S 149º55.64’E, on a yellow-orange erect multilamellate sponge, 9 m, coll. R. T. Springthorpe , 18 May.1995 . Victoria: 1 ex., NMV J44962 , near South Channel Fort, Port Phillip Bay . 4 ex., NMV J44937 , 15 km south of Port Fairy, 38 32.0’S, 142 28.6’E, 52 m depth, Western Bass Strait , medium sand, grab, sled or trawl, coll. R. S. Wilson on RV Tangaroa , 20 Nov.1981 . 1 ex., NMV J26802 , 15.5 km southwest of Point Ricardo, 37 53.14’S, 148 28.94’E, 45 m depth, Eastern Bass Strait , medium sand, Smith-McIntyre grab, coll. N. Coleman on RV Sarda, Feb.1991 . 2 ex., NMV J44934 , 35 km south southwest of Cape Otway, 39 06’S, 143 21’E, Western Bass Strait , 59 m, coarse sand, Smith-McIntyre grab/naturalist’s dredge, coll. G.C.B. Poore on HMAS Kimbla , 8 Oct.1980 . 3 ex., NMV J44961 , Westernport Bay . South Australia: 15 ex., AM E4852 , 64 km west of Kingston , 36º50’S 139º05’E, 55 m, FIS Endeavour, 1909-1914 . 5 ex., AM P5926 , 64 km west of Kingston , 36º50’S 139º05’E, 54.8 m, FIS Endeavour, 1909-1914 . 1 ex., AM E4842 , 24 km north west of Cape Jervis, 31 m, FIS Endeavour , 16 Mar. 1909 . 2 ex., AM E4855 , Sanders Bank, Kangaroo Island , 35º50’S 137º15’E, 51 m, FIS Endeavour, 1909- 1914 .

Type locality. – Port Jackson , New South Wales, Australia .

Description. – (based on female, AM P54154). Head: length 3 x width; rostrum subacute. Antenna 1 shorter than antenna 2; peduncular article 1 subequal to article 2; accessory flagellum present, accessory flagellum 1-articulate; flagellum 28+ articles. Antenna 2 flagellum 35+ articles. Mandible left incisor with 8 serrations, right incisor with 6 serrations; accessory setal rows: left with 9 setae, right with 9 setae; molar, triturating surface well developed basally; palp article 2 slender, length 3 x breadth, 1.17 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 3 apical pappose setae; outer plate with 11 setal-teeth; palp with 11 apical robust setae and many subapical slender setae.

Pereon. Pereonite 7 posterodorsal margin curved, with setae along posterior margin. Gnathopods 1 and 2 not sexually dimorphic; simple with long, slender setae along posterior margin. Gnathopod 1 basis 0.61 x carpal length; carpus 1.05 x propodal length. Gnathopod 2 basis 0.67 x carpal length; carpus 1.05 x propodal length. Pereopods 3–4 sexually dimorphic; 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 1.84 x breadth; propodus length 3.74 x breadth, 1.53 x carpal length, with 1 row of posterodistal robust setae. Pereopod 4 carpus length 1.79 x breadth; propodus length 3.96 x breadth, propodus 1.75 x carpal length, with 4 rows of posterodistal robust setae. Pereopod 5 coxa with subacute posterodistal corner; basis length 1.49 x breadth, basis with strongly setose posterior margin; carpus without anterodistal bump, with strongly setose posterior margin; propodus length 4.68 x breadth, propodus with strongly setose posterior margin. Pereopod 6 coxa with subacute posterodistal corner; basis length 1.48 x breadth, basis with strongly setose posterior margin; carpus without anterodistal bump, with strongly setose posterior margin; propodus length 4.77 x breadth, propodus with strongly setose posterior margin. Pereopod 7 basis length 0.97 x breadth, with projecting acute posterodorsal corner, with strongly setose posterior margin, posteroventral corner bicuspidate, cusps subequal in size; carpus without anterodistal bump, with strongly setose posterior margin; propodus length 7.14 x breadth, propodus with strongly setose posterior margin.

Pleon. Pleonite 1 posterodorsal margin smooth, without spines or bulges, pleonite 1 with setae along posterior margin, posterolateral margins with two strong spines. Pleonite 2 smooth, without spines or bulges, with setae along posterior margin, posterolateral margin with two strong spines. Pleonite 3 with setae along posterior margin, posterolateral margin with one small lateral spine. Urosomite 1 short, less than 2 x length of urosomite 2. Uropod 1 outer ramus 0.72 x inner ramus. Uropod 2 outer ramus 0.63 x inner ramus. Uropod 3 peduncle with well developed distomedial flange; outer ramus 0.26 x inner ramus; inner ramus with proximal setal fan. Telson longer than broad, tapering distally, with large apical setae.

Figures

Fig. 4. Icilius australis Haswell, 1879: male AM P54152, Burrill Rocks, Ulladulla, N.S.W., Australia. Scales represent 0.5 mm.