Icilius caledoniana Watson, Lowry & Steinberg, 2004

Lowry, J. K. & Hughes, L. E., 2009, Iciliidae *, Zootaxa 2260 (1), pp. 453-457 : 453-456

Icilius caledoniana Watson, Lowry & Steinberg, 2004

( Figs 1 , 2 )

Icilius caledoniana Watson, Lowry & Steinberg, 2004: 476 , figs 7–8. Material examined. 1 female, 3.0 mm, 3 slides, AM P 75502 (JML 81/26-11-4) ; 1 female, 2.5 mm, AM P 75503 (JML 81/26-11-4) ; 43 females, AM AM P 75504 (JML 81/26-11-4) .

Type locality. Off I’îlot Maitre, Southwest Lagoon, New Caledonia (22°19.61'S 166°24.7’E), living on the calcareous green alga Halimeda sp. , 10.5 m depth .

Description. Based on female, 3.0 mm, AM P75502.

Head. Head rostrum rounded. Antenna 1 peduncular article 1 longer than (1.19 x) article 2; accessory flagellum present, accessory flagellum 1-articulate; flagellum 29+ articles. Antenna 2 flagellum 28+ articles. Mandible left incisor with 5 serrations, right incisor with 6 serrations; accessory setal rows: left with 8 setae, right with 9 setae; molar, triturating surface well developed basally; palp article 2 slender, length 4 x breadth, 1.1 x article 3; article 3 slender, straight, 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 4 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 0.9 x carpus length; carpus subequal in length to propodus length. Gnathopod 2 basis 0.8 x carpus length; carpus 1.2 x propodus length. Pereopods 3–4 sexually dimorphic; similar in size to pereopods 5–6; simple; basis without midmedial row of vertical pappose setae, without submarginal row of robust setae, without marginal row of pappose setae. Pereopod 3 carpus length 2.4 x breadth; propodus length 4.3 x breadth, 1.6 x carpus length, with 2 rows of posterodistal robust setae. Pereopod 4 carpus length 3.2 x breadth; propodus length 5.3 x breadth, propodus 1.4 x carpus length, with 2 rows of posterodistal robust setae. Pereopod 5 coxa with rounded posteroventral corner; basis length 2.8 x breadth, basis with weakly setose posterior margin; carpus with well developed anterodistal bump, with weakly setose posterior margin; propodus length 7.3 x breadth, propodus with weakly setose posterior margin. Pereopod 6 coxa with subacute posterodistal corner; basis length 1.9 x breadth, basis with weakly setose posterior margin; carpus with well developed anterodistal bump, with weakly setose posterior margin; propodus length 3.5 x breadth, propodus with weakly setose posterior margin. Pereopod 7 coxa with rounded posteroventral corner; basis length 1.7 x breadth, basis with rounded posterodorsal corner, with weakly setose posterior margin, posteroventral corner bicuspidate, outer cusp much longer than inner; carpus with well developed anterodistal bump, with weakly setose posterior margin; propodus length 9.4 x breadth, propodus with weakly setose posterior margin.

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 short, less than 2 x length of urosomite 2. Uropod 1 outer ramus 0.9 x inner ramus. Uropod 2 outer ramus 0.6 x inner ramus. Uropod 3 peduncle with well developed distomedial flange; outer ramus 0.4 x inner ramus; inner ramus without proximal setal fan. Telson longer than broad, tapering distally, with tiny apical setae.

Habitat. Living in algae and sediment, 32–38 m depth.

Remarks. This is the first record of I. caledoniana from Australia and the only record of the genus from the Great Barrier Reef.

Distribution. Australia. Queensland: Carter Reef, Lizard Island (current study). New Caledonia. Southwest Lagoon (Watson, et al. 2004).

Figures

FIGURE 1. Icilius caledoniana Watson, Lowry & Steinberg, 2004, female habitus, 2.5 mm AM P75503; female, 3.0 mm, AM P75502, between Lizard Island and Carter Reef, Great Barrier Reef.

FIGURE 2. Icilius caledoniana Watson, Lowry & Steinberg, 2004, female, 3.0 mm; AM P75502, between Lizard Island and Carter Reef, Great Barrier Reef.