Iphiplateia marleneae, Coleman, Oliver & Lowry, James K., 2012

Coleman, Oliver & Lowry, James K., 2012, Revision of the genus Iphiplateia (Crustacea, Amphipoda, Phliantidae) from Australia, Zootaxa 3393, pp. 1-26 : 2-5

Iphiplateia marleneae sp. nov.

( Figs 1–4)

Type material. Holotype, ovigerous female (4 microscopic slides with parts of holotype), 6.4 mm, AM P.80304, inner lagoon, Ningaloo reef, Western Australia (21°53'8"S 113°59'26"E), brown alga, Lobophora sp., 1.5 m depth, leg. L.E. Hughes on SCUBA, 18 June 2008, MI WA-987, NR-18, C Reefs no. 3162. Paratypes from same station: AM P.80305, 4 females, 4 males, 1 juveniles, 1 damaged specimen; AM P.80306, 1 slide with total male paratype.

Type locality. Inner lagoon, Ningaloo reef, Western Australia (21°53'8"S 113°59'26"E), 1.5 m depth.

Additional material examined. 1 female, AM P.80316, southern side of Kendrew Island, Dampier Archipelago, Western Australia (-20.48306° 116.54222°), Sargassum sp. on sand, 4.4 m depth, leg. R.A. Peart, 30 August 1999, WA-693; 1 juvenile, AM P.80317, Tish Point, Rosemary Island, Dampier Archipelago, Western Australia (-20.4945° 116.59817°), Dictyopteris sp., intertidal zone, 0.5 m depth, leg. R.A. Peart, 30 August 1999, WA-687; 13 females, AM P.80307, inner lagoon, Ningaloo reef, Western Australia (21°53'9"S 113°59'26"E), brown algae, 2.6 m depth, leg. L.E. Hughes on SCUBA, 19 June 2008, MI WA-988, NR-20, CReefs no. 3173; 1 female, AM P.80308, southern side of pass, Ningaloo reef, Western Australia (21°54'43"S 113°57'6"E), algae, 4.5 m, leg. N.L. Bruce & M. Blazewicz-Paszkowycz on SCUBA, 6 June 2008, MI WA-970, NIN 0 0 5, CReefs no. 3048.3 females, AM P.80307, inner lagoon, Ningaloo reef, Western Australia (21°53'9"S 113°59'26"E), brown algae, 2.6 m depth, 19 June 2008, leg. L.E. Hughes on SCUBA, MI WA-988, NR-20, CReefs no. 3173; 1 female, AM P.80308, southern side of pass, Ningaloo reef, Western Australia (21°54'43"S 113°57'6"E), algae, 4.5 m depth, leg. N.L. Bruce & M. Blazewicz-Paszkowycz on SCUBA, 6 June 2008, MI WA-970, NIN 0 0 5, CReefs no. 3048; 5 specimens, AM P.80320, Neds Camp, Cape Range National Park, Western Australia (-22° 113.9°), green brown algae, 1 m depth, leg. R. Springthorpe, 2 January 1984, WA-373.1 female, AM P.80315, west side of Malus Island, Dampier Archipelago, Western Australia (-26.51017° 116.64867°), fine Dictyota , sand and algal bottom, 2.3 m depth, leg. R.A. Pearth, 27 August 1999, WA-670; specimen, AM P.80319, Red Bluff, Kalbarri, Western Australia (-27.7° 113.1°), mixed corallines, 3 m depth, leg. R. Springthorpe, 10 January 1984, WA-480; 2 females, 1 male (?), AM P.80321, off Possession Point, King George Sound, Western Australia (-35.04167° 117.9°), brown algae, 7 m depth, leg. R. Springthorpe, 14 December 1983, WA-138; 1 ov. female, AM P.80318, off Possession Point, King George Sound, Western Australia (-35.04167° 117.9°), sand and detritus from bases of seagrasses, 10 m depth, leg. R. Spring- thorpe & J.K. Lowry, 14 December 1983, WA-131.

Etymology. This species is named for Marlene Coleman, the beloved mother of the senior author.

Description. Based on female holotype, 6.4 mm. Body shape ( Fig. 1a) almost circular from above, coxal plates splayed very much, body flat, without a trace of a dorsal carina, except for a weak mid-dorsal elevation on pereonite 7 and pleonite 1. Pereonites 3 and 4 longest. Pleonite 1 with a pointed posteromarginal narrow tooth.

Head subquadrate, seen from above, shorter than the length of the first coxal plates, which partly cover the sides of the head; rostrum short and rounded; eyes small and round. Antenna 1 ( Fig. 1f), peduncular article 1 largest, with a subquadrate anterior lobe, which is more than half as broad as article width; article 2 half as wide as article 1; flagellum 2-articulate (2nd article minute), this with long aesthetascs apically. Antenna 2 ( Fig. 1b) long and slender; peduncular article 4 and 5 slender, not urn-shaped, flagellum 2-articulate. Upper lip wide, rectangular, with a shallow depression distally. Mandible ( Fig. 2a, b) incisors dentate; raker row consisting of 3 small spines; molar just a narrow protrusion with a terminal seta, not triturative; no palp present. Lower lip ( Fig. 1d) with small lobes and short mandibular processes. Maxilla 1 ( Fig. 1g) inner plate missing (?), outer plate with 5 apical robust serrate setae, no palp present. Maxilla 2 ( Fig. 1e) inner plate slightly wider than outer plate with few short stout setae apicomarginally. Maxilliped ( Fig. 2c, f) inner plate apically truncate, with nodular setae distally; outer plate wide and rounded with few setae mediomarginally, palp 4-articulate, articles 2 and 3 medially produced with long slender setae, article 4 knob-like.

Pereon. Pereopod 1 ( Fig. 2e) coxa large, triangular, covering basis to merus; basis expanded distally; ischium as long as merus; merus with anteromarginal notch and posterodistally drawn out; carpus with anterodistal group of robust setae; propodus nearly as long as carpus, with posterodistal robust setae; no palm present; dactylus relatively slender. Pereopod 2 ( Fig. 2d) similar in shape, but shorter and coxa only slightly expanded distally, rather subrectangular. Pereopod 3 ( Fig. 3a) coxa similar in shape to that of pereopod 2, but wider; basis expanded distally; ischium somewhat shorter than merus; merus with a deep shallow notch anteromarginally; carpus subquadrate and shorter than propodus; propodus tapering distally, with 1 robust seta posterodistally; dactylus relatively slender. Pereopod 4 ( Fig. 3b) similar to pereopod 3, however the coxa has a posterodistal truncate lobe. Pereopod 5 ( Fig. 3c) with bilobed coxa, anterior lobe larger than posterior; basis posteromarginally rounded with a ventral lobe as long as the distal margin of the ischium; ischium wider as long, anteriorly convex; merus wide and expanded distally, with posteroproximomarginal notch, rounded drawn out antero- und posterodistally; carpus excavate anteriorly, with a rounded protrusion anteroproximally; propodus oval, with distal robust setae on anterodistal region. Pereopod 6 ( Fig. 3d) similar to pereopod 5, but coxa narrower and basis wider. Pereopod 7 ( Fig. 4a) with smallest coxa, bilobed; basis posterior lobe dramatically drawn out and roundly angular; ischium wider than long; merus anterior margin straight ending in a rounded lobe, posterior margin posteriorly expanded; carpus anterior margin straight and drawn out distally, this process longer than that of posterodistally; propodus and dactylus as for pereopods 5 and 6.

Pleon. Pleopod 1 ( Fig. 4e) peduncle subrectangular, as long as inner ramus, with 5 coupling hooks; outer ramus distinctly (1.3 x) longer than inner. Pleopod 2 ( Fig. 4d) peduncle wider than long, expanded medially, with 5 coupling hooks; outer ramus 1.3 x as long as inner ramus; inner ramus longer than peduncle. Pleopod 3 ( Fig. 4b) peduncle very short, with a long narrow medial lobe, at its end 3 coupling hooks; inner ramus minute, scale-like, half the length of the peduncle; outer ramus long, 2.5 x as wide as inner ramus. Uropod 1 ( Fig. 4f, c) about 2 x as long as uropod 2; outer ramus subequal in length to peduncle, inner ramus 68% of outer. Uropod 2 peduncle as long as inner ramus; outer ramus 1.2 x as long as inner ramus. Uropod 3 peduncle wide and largely hidden by telson; inner ramus wanting, outer ramus 0.7 x peduncle length and half as wide. Telson ( Fig. 4f) with parallel margins tapering into a rounded apex.

Sexual dimorphism. The outline of the habitus of the male is not circular but rather oval.

Remarks. For differences between this new species and Iphiplateia whiteleggei Stebbing, 1899 , see Table 1 .

Distribution. Western Australia: Ningaloo Reef; Kalbarri; Dampier Archipelago; King George Sound.

b

a

d

c g e f a

b d

c

f

e a b c d e a d c b e f