Iphiplateia whiteleggei Stebbing, 1899

Coleman, Oliver & Lowry, James K., 2012, Revision of the genus Iphiplateia (Crustacea, Amphipoda, Phliantidae) from Australia, Zootaxa 3393, pp. 1-26 : 8-15

Iphiplateia whiteleggei Stebbing, 1899

( Figs 5–8)

Iphiplateia whiteleggei Stebbing, 1899 , p. 415, p1. 34. — Stebbing, 1906, p. 203, figs 52, 53. — J.L. Barnard, 1981, p. 1216, figs 1–3. — Ishimaru, 1986, p. 173, figs 1–4. — Ledoyer, 1984, p. 93, fig. 45. Iphiplateia sp. cf. whiteleggi [sic]: Mawatari et al., 1985, p. 8.

Iphiplateia sp.: Ishimaru, 1985, p. 102, fig. 2.

Type material studied. 3 slides with syntype material: 1 slide with complete, un-dissected specimen, designated as lectotype herein, AM P.80309, Watsons Bay, Port Jackson, New South Wales, Australia (33°50'48"S 151°16'48"E), leg. T. Whitelegge. Paralectotypes: 2 slides, AM P.4098, same collection data.

Type locality. Watsons Bay, Port Jackson, New South Wales, Australia (33°50'48"S 151°16'48"E).

Additional material examined. Torres Strait: 9 specimens, AM P.80301, Northwest Islet, Torres Strait, Queensland, Australia (1018.909'S 1425.435'E), brown alga, Padina sp., 5.3 m depth, leg. M. Capa & L.E. Hughes on SCUBA, 1 October 2006, QLD 1917; 1 female with offspring, AM P.80302, near-shore, western side of Hawkesbury Island, Torres Strait, Queensland, Australia (1021.74'S 1427.07'E), soft bottom sediment and pieces of coral rubble, 6 m depth, leg. J.K. Lowry & M. Capa on SCUBA, 1 October 2006, QLD 1902; 2 specimens, AM P.80303, near-shore, western side of Hawkesbury Island, Torres Strait, Queensland, Australia (1021.74'S 1427.07'E), 8 m depth, leg. J.K. Lowry & M. Capa on SCUBA, 1 October 2006, QLD 1904; 10 specimens, AM P.80297, Sunken Reef, north of Goodes Island, Torres Strait, Queensland, Australia (1031.489'S 1423.316'E), brown alga, Padina sp. on agglomerated coral rubble, 12 m depth, leg. J.K. Lowry & M. Capa on SCUBA, 29 September 2006, QLD 1859; 4 specimens (1 small specimen with eyes wider), AM P.80296, Sunken Reef, north of Goodes Island, Torres Strait, Queensland, Australia (1031'29'' S 14203 '19''E), brown alga, Sargassum sp., 15 cm tall, 12 m depth, leg. M. Capa & J.K. Lowry on SCUBA, 29 September 2006, QLD 1866; 3 specimens, AM P.80290, Sunken Reef, north of Goodes Island, Torres Strait, Queensland, Australia (1031.489'S 1423.316'E), short complex red algae, 12 m depth, leg. J.K. Lowry & M. Capa on SCUBA, 29 September 2006, QLD 1860; 1 specimen, AM P.80295, Sunken Reef, north of Goodes Island, Torres Strait, Queensland, Australia (1031.489'S 1423.316'E), coral rubble, 12 m depth, leg. J.K. Lowry & M. Capa on SCUBA, 29 September 2006, QLD 1867; 23 specimens, AM P.80292, number one reef, Katai Nab, North of Horn Island, Torres Strait, (1032.502'S 14210.259'E), brown alga, Sargassum sp., 10–15 cm tall, 7.8 m depth, leg. L.E. Hughes & J.K. Lowry on SCUBA, 28 September 2006, QLD 1848; 5 specimens, AM P.80293, number one reef, Katai Nab, North of Horn Island, Torres Strait, Queensland, Australia (1032.502'S 14210.259'E), coarse coral rubble, 5.6 m depth, J.K. Lowry on SCUBA, 28 September 2006, QLD 1850; 9 specimens, AM P.80289, number one reef, Katai Nab, North of Horn Island, Torres Strait, Queensland, Australia (1032.502'S 14210.259'E), large brick covered in fine sediment, epiphytes, brown alga, Padina sp., low turfing algae, 8 m depth, leg. J.K. Lowry & L.E. Hughes on SCUBA, 28 September 2006, QLD 1851; 7 specimens, AM P.80298, reef between Hammond Island and Goodes Island, Torres Strait, Queensland, Australia (1033.722'S 14210.462'E), 7.9 m depth, brown alga, Dictyota sp., leg. L.E. Hughes & M. Capa on SCUBA, 28 September 2006, QLD 1855; 2 specimens, AM P.80291, reef between Hammond Island and Goodes Island, Torres Strait, Queensland, Australia (1033.722'S 14210.462'E), branching red algae, brown alga, Dictyota sp., 9 m depth, leg. L.E. Hughes & M. Capa on SCUBA, 28 September 2006, QLD 1856; 1 specimen, AM P.80299, drop off at the northern-western corner of Hammond Island, Torres Strait, Queensland, Australia (1032.407'S, 14211.331'E), red macrophyte, 15 m depth, leg. L.E. Hughes & J.K. Lowry on SCUBA, 28 September 2006, QLD 1882; 1 specimen, AM P.80294, reef between Hammond Island and Goodes Island, Torres Strait, Queensland, Australia (1033.722'S 14210.462'E), brown alga, Padina sp. on rock, 9 m depth, leg. M. Capa & L.E. Hughes on SCUBA, 28 September 2006, QLD 1892; 6 specimens, AM P.80300, north-west corner of Goodes Island, Torres Strait, Queensland, Australia (1033.579'S 1429.143'E), brown alga, Dictyota sp., 9.4 m depth, leg. L.E. Hughes & M. Capa on SCUBA, 29 September 2006, QLD 1875.

New South Wales: 18 specimens, AM P.80285, north-east side of Cabbage Tree Island, north-east of Port Stephens, New South Wales, Australia (32°41'06"S 152°13'36"E), brown alga from rocks, 16.4 m depth, leg. K.B. Attwood & C. Fraser on SCUBA, 8 March 2006, NSW-2087; 1 specimen, AM P.80286, 10 m west of Little Beach boat ramp, Port Stephens, New South Wales, Australia (32°43'12"S 152°09'36"E), brown alga, Padina sp., 0.5 m depth, leg. C. Fraser on snorkel, 10 March 2006, NSW-2921; ovigerous female (illustrated), plus 2 adult females and 2 juvenile females, AM P.80288, Clovelly Bay, Sydney, New South Wales, Australia, (33°55.01'S 151°15.98'E), brown alga, Sargassum sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1699; 14 specimens, AM P.80264, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Sargassum sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1692; 16 specimens, AM P.80265, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Sargassum sp., 6 m depth, leg. R. Peart & K. Dempsey, 16 December 1999 on SCUBA, NSW-1693; 16 specimens, AM P.80266, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Sargassum sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1694; 16 specimens, AM P.80267, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Sargassum sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1696; 3 specimens, AM P.80268, Clovelly Bay, Sydney, New South Wales, Australia, (33°55.01'S 151°15.98'E), brown alga, Padina sp., 6 m depth, leg R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1697; 1 specimen, AM P.80269, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Padina sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 16 December 1999, NSW-1698; 2 females (one of those with juveniles), AM P.80263, Clovelly Bay, Sydney, New South Wales, Australia (33°55.01'S 151°15.98'E), brown alga, Dictyota sp., 6 m depth, leg. R. Peart & K. Dempsey on SCUBA, 19 January 2000, NSW-1717; 1 specimen, AM P.80260, north-west of Brush Island, New South Wales, Australia (35°31'39"S 150°24'57"E), brown alga, Phyllospora comosa , from scattered low reefs, rocks and sand 17.8 m depth, leg. P.B. Berents, J. Eu, A.J Millar & G.D.F. Wilson on SCUBA, 9 February 2003, NSW-2028; 2 specimens, AM P.73255, north-west side of Tollgate Islands, Batemans Bay, New South Wales, Australia (35°44'49"S 150°15'31"E), brown alga, Colpomenia sinnuosa , 7.9 m depth, leg. G.D.F. Wilson & A. Millar on SCUBA, 28 October 2002, NSW-2030; 1 specimen, AM P.80262, west side of Tollgate Island, Batemans Bay, New South Wales, Australia (35°44'55"S 150°15'27"E), brown alga, Stygopodium flabelliforme, from scattered low reefs, rocks and sand 9 m depth, leg. P.B. Berents, J. Eu, A.J Millar & G.D.F. Wilson on SCUBA, 11 February 2003, NSW-2055; 1 specimen, AM P.80261, north of Jimmys Island, New South Wales, Australia (35°48'58"S 150°14'06"E), brown alga, Sargassum sp. (large form with floats), 16 m depth, leg. A. Millar, N. Yee & G.D.F. Wilson on SCUBA, 29 October 2002, NSW-2007.

Lord Howe Island: 22 specimens, AM P.80246, between Comet Hole and the reef (~ 31°31'33.8''S 159°03'06.11''E), Lord Howe Island, assorted red and brown algae and some corals, 2–3 m depth, leg. J.K. Lowry, 10 May 1977, LHA-11; 15 specimens plus 1 juvenile specimen in bad shape in extra tube, AM P.80245, reef-front south of North Passage (~ 31°31'52.95''S 159°03'07.10''E), between rubble spurs straight out from Signal Point, lagoon, Lord Howe Island, mainly coralline algae, 1.5–2 m depth, leg. G.D. Fenwick, 11 May 1977, LHA-17.

Norfolk Island: 1 specimen, AM P.80273, Cathedral Rock, Norfolk Island, Australia (290.21'S 16756.95'E), under stones; 10.9 m depth, 21ºC, leg. R.T. Springthorpe, airlift on SCUBA, MV Jenny, 13 May 2008, MI NFK-7; 2 specimens, AM P.80274, Cathedral Rock, Norfolk Island, Australia, (290.21'S 16756.95'E), red coralline algae, Amphiora anceps; 11.8 m depth, 21ºC, leg. L.E. Hughes, on SCUBA, MV Jenny, 13 May 2008, MI NFK-10; 1 specimen, AM P.80270, Duncombe Bay, Norfolk Island, Australia (293.494'S 16757.221'E), 15 m depth, 21ºC, leg. J.K. Lowry & R.T. Springthorpe on SCUBA, MV Jenny, 13 May 2008, MI NFK-13; 1 specimen, AM P. 80272, The Wall, Neapean Island, Norfolk Island, Australia (294.297'S 16757.68'E), green alga, Halimeda sp., 17 m depth, 21ºC, leg. J.K. Lowry on SCUBA, MV Jenny, 15 May 2008, MI NFK-45; 2 specimens, AM P.80271, east of Sail Rock, Norfolk Island, Australia (296.909'S 16757.521'E), large brown alga, Dictyota sp.; 15 m depth, 21ºC, leg. R.T. Springthorpe & L.E. Hughes on SCUBA, MV Jenny, 14 May 2008, MI NFK-27.

Description. Based on ovigerous female, 3.3 mm. Body shape ( Fig. 5a) oval from above, coxal plates splayed very much, body flat, without a dorsal carina, except for a small mid-dorsal hump on pereonite 7 and pleonite 1. Pereonite 4 longest. Pleonite 1 with a pointed posteromarginal narrow tooth.

Head shorter than coxal plates 1 which partly cover the lateral sides of the head; eyes small, rounded; rostrum wide, rounded. Antenna 1 ( Fig. 5d) peduncular article 1 with distal rounded lobe, half as wide as maximum article width; article 2 with a similar lobe, but with a convex outer margin; flagellum 2-articulate. Antenna 2 ( Fig. 5c) peduncular articles 4 and 5 widened, urn-shaped; flagellum of 2 articles. Upper lip ( Fig. 5b) wide, rectangular, truncate distally. Mandible ( Fig. 5f, g) incisors dentate; raker row consisting of 3 small spines; molar just a narrow protrusion, not triturative; no palp present. Maxilla 1 ( Fig. 5h) inner plate missing (?), outer plate with 5 apical robust serrate setae, no palp present. Maxilla 2 ( Fig. 5e) inner plate twice as wide than outer plate with few short stout setae apicomarginally. Maxilliped ( Fig. 6a) inner plate apically truncate, with nodular setae distally; outer plate wide and rounded with few setae mediomarginally; palp 4-articulate, article 2 medially slightly produced with long slender setae, article 3 half as wide as article 2, article 4 knob-like.

Pereon. Pereopod 1 ( Fig. 6c) coxa distally expanded; basis expanded posteromarginally; ischium and merus subequal in length; merus and carpus connected by oblique articulation; carpus and propodus subequal in length, anterodistal margin of carpus with a row of stout setae; dactylus stout. Pereopod 2 ( Fig. 6b) coxa subrectangular, somewhat expanded posterodistally; basis to dactylus similar in shape as in pereopod 1, but without distal row of stout setae on carpus. Pereopod 3 ( Fig. 7a) coxa subrectangular; basis expanded posteromarginally; ischium longer than merus, slightly oblique distally; merus distally expanded and anterodistal corner drawn out; carpus as long as merus; propodus 1.5 x carpus length; dactylus stout. Pereopod 4 ( Fig. 7c) coxa as long as broad, posteroproximally excavate; basis to dactylus as in pereopod 3. Pereopod 5 ( Fig. 7b) coxa wider than long, bilobate, anterior lobe much larger as posterior lobe; basis long and strongly expanded posteriorly, with a wide lobe ventrally; ischium wider than long; merus very wide, drawn out antero- and posterodistally; carpus ovoid with distomarginal lobe; propodus as long as width of merus; dactylus falcate. Pereopod 6 ( Fig. 7d) similar to pereopod 5, but coxa smaller and basis not as wide. Pereopod 7 ( Fig. 8a) coxa small, weakly bilobed, posterior lobe much smaller than anterior one; basis large with ovoid posterior lobe, strongly expanded ventrally; ischium to dactylus subequal to pereopods 5 and 6.

Pleon. Pleopod 1 ( Fig. 6d) peduncle subrectangular, slightly shorter than inner ramus, with 4 coupling hooks; outer ramus slightly (1.1 x) longer than inner. Pleopod 2 ( Fig. 8b) peduncle as wide as long, expanded medially, with 4 coupling hooks; outer ramus 1.4 x as long as inner ramus; inner ramus longer than peduncle. Pleopod 3 ( Fig. 8c) peduncle very short, with a long narrow medial lobe, at its end 3 coupling hooks; inner ramus minute, scalelike, half the length of the peduncle; outer ramus long, 3 x as wide than inner ramus. Uropod 1 about 2 x as long as uropod 2; outer ramus subequal in length to peduncle, inner ramus 65% of outer. Uropod 2 ( Fig. 8d) peduncle as long as inner ramus; outer ramus 1.2 x as long as inner ramus. Uropod 3 ( Fig. 8d) peduncle wide and largely hidden by telson; inner ramus wanting. Telson ( Fig. 8d) ovoid.

Sexual dimorphism. The width of the habitus of the male is somewhat narrower, than in the female, thus the body shape is more oval compared to the circular female.

Remarks. The material drawn and redescribed, collected very close to the type locality, is morphologically very similar to the type material, that we also studied. This consists of 3 microscopic slides. We selected the one with a complete, well preserved specimen as lectotype.

b

a

c d g

h

e f a b c d b a d

c

a

b d

c Barnard (1981) published a very good redescription of I. whiteleggei from Madang ( Papua New Guinea). Ishimaru (1986) also redescribed the species based on material from Japan and compared it with Barnard´s study and the original description of Stebbing (1899).

For differences between I. whiteleggei and I. marleneae sp. nov., see Table 1 .

Distribution. South-eastern Australia, Lord Howe Island, Norfolk Island, Torres Strait, New Caledonia, Papua New Guinea, Hokkaido (northern Japan).