The genus Floresorchestia (Amphipoda: Talitridae) on Cocos (Keeling) and Christmas Islands Lowry, J. K. Springthorpe, R. T. Memoirs of Museum Victoria 2009 2009-12-31 66 1 117 127 6J9XC Lowry & Springthorpe 2009 [147,386,1441,1463] Malacostraca Talitridae Floresorchestia Animalia Amphipoda 5 122 Arthropoda species poorei sp. nov.  ( Figures 1 – 7)  Material examined.  Holotype: Indian Ocean, Cocos (Keeling) Islands, West Island, Rumah Baru, ( 12°09'22"S 96°49'41"E), beach wrack, J.K. Lowryand K.B. Attwood,  8 Oct 2008, (stn MI WA 819), AM P80192(ovigerous female, 9.2 mm).  Paratypes:type locality,  AM P80193(male,11.7 mm);  AM P80194(many specimens);  AM P80532(female);  AM P80543(female);  AM P80544(male);  AM P80549(male). Other material:  Indian Ocean, Cocos (Keeling) Islands, West Island, Government House Beach, ( 12°05'04"S 96°52'54"E), sand beach, J.K. Lowry, L.E. Hughesand K.B. Attwood,  7 Oct 2008, (stn MI WA 780), AMP.80545 (many specimens). Indian Ocean, Cocos (Keeling) Islands, West Island, beach near “Two Trees dive site”, ( 12°05'04"S 96°52'54"E), J.K. Lowry, L.E. Hughesand K.B. Attwood,  7 Oct 2008, (stn MI WA 779), AMP.80547 ( 6 males, 7 females).  Type locality.  Rumah Baru, West Island, Cocos (Keeling) Islands, Indian Ocean( 12°09'22"S 96°49'41"E).  Etymology.Named for our good friend Gary Poore in thanks for his help over the years and in recognition of his immense contribution to the field of carcinology.  Description.Based on holotype, ovigerous female, AM P80192.  Head. Eyelarge (greater than 1/3 head length). Antenna 1short, rarely longer than article 4 of antenna 2 peduncle. Antenna 2up to half body length; peduncular articles narrow; article 5 longer than article 4. Mandibleleft lacinia mobilis 5-dentate. Maxillipedpalp article 2 distomedial lobe well developed, 4 reduced, button-shaped.  Pereon. Gnathopod 1sexually dimorphic; parachelate; coxa 1 smaller than coxa 2; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae, in male only; propodus subrectangular, propodus posterior margin with 3 cuspidate setae along posterior margin, propodus posterior margin with 3 serrate setae along posterior margin; palm acute, palm with 4 serrate setae; dactylus longer than palm. Gnathopod 2sexually dimorphic; mitten-shaped; coxal gill simple or slightly lobate; basis anterior margin smooth, basis expanded proximally; ischium without posterodistal lobe on medial surface; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; carpus well developed (not enclosed by merus and propodus), posterior lobe present, projecting between merus and propodus; palm obtuse, smooth, not lined with robust setae, palm without patch of tiny denticles at corner of palm; dactylus subequal in length to palm, not attenuated distally; gill simple, not incised. Pereopods 2–4coxae wider than deep. Pereopods 3–7cuspidactylate. Pereopod 4subequal or slightly shorter than pereopod 3; carpus significantly shorter than carpus of pereopod 3; dactylus thickened proximally with a notch midway along the posterior margin. Pereopod 5propodus distinctly longer than carpus. Pereopods 6–7longer than pereopods 3–5. Pereopod 6not sexually dimorphic; slightly shorter than pereopod 7; posterior lobe inner view posteroventral corner rounded, posterior margin perpendicular to ventral margin, posterior lobe with ridge, posterior lobe with 1–2 marginal setae. Pereopod 7not sexually dimorphic; basis lateral sulcus absent, basis posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, broadly rounded; distal articles (merus and carpus) slender; merus posterior margin evenly rounded; propodus setation without large distal tuft of setae. Oostegiteslong (length greater than 2 x width), longer than wide, weakly setose (6–11 setae), setae with spatulate tips.  Pleon. Pleopodsall well developed. Pleopod 1peduncle with marginal slender setae; biramous, outer ramus shorter than peduncle, inner ramus subequal in length to outer; inner ramus with 9 articles; outer ramus with 6 articles. Pleopod 2peduncle with marginal slender setae; biramous, inner ramus subequal in length to outer, outer ramus shorter than peduncle; inner ramus with 7 articles. Pleopod 3peduncle without marginal setae. Pleopod 3biramous, inner ramus subequal in length to outer, outer ramus shorter than peduncle; rami multarticulate; inner ramus with 6 articles; outer ramus with 6 articles. Epimera 2–3each with a stridulating organ just above ventral margins. Epimera 2subequal in length to epimeron 3, with 27 ridges. Epimera 3with 17 ridges, posterior margin smooth, without setae, posteroventral corner with small subacute tooth, ventral margin without robust setae. Uropod 1not sexually dimorphic, peduncle with 8 robust setae, distolateral robust seta small; with simple tip; inner ramus subequal in length to outer ramus, with 3 marginal robust setae; outer ramus without marginal robust setae. Uropod 2not sexually dimorphic; peduncle with 6 robust setae; inner ramus subequal in length to outer ramus, with 2 marginal robust setae; 1 marginal robust setae. Uropod 3peduncle with 3 robust setae; ramus shorter than peduncle, ramus linear (narrowing), with 2 marginal robust setae, with 4–5 apical setae. Telsonlonger than broad, completely cleft, with 5 marginal and apical robust setae per lobe.  Figure 4.  Floresorchestia poorei sp. nov., paratype, male, 11.7 mm, AM P80193.  Male(sexually dimorphic characters). Based on male, AM P80193. Gnathopod 1subchelate, posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; propodus subtriangular with well developed posterodistal lobe, anterior margin with 3 groups of robust setae, lateral surface with 2 cuspidate setae, posterolateral surface with 5 serrate setae, propodus posterior margin without cuspidate or serrate setae along posterior margin; palm transverse, dactylus subequal in length to palm. Gnathopod 2subchelate; basis slightly expanded; ischium distal triangular posterodistal lobe on medial surface; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; carpus triangular, reduced (enclosed by merus and propodus), posterior lobe absent, not projecting between merus and propodus; propodus subovate; propodus twice as long as wide; palm acute, lined with robust setae; palm with cuticular patch of tiny denticles at corner of palm, posteromedial surface of propodus with groove; dactylus longer than palm, attenuated distally.  Habitat. Living in the supralittoral zone on sheltered beaches under seaweeds and debris.  Remarks.  Floresorchestia pooreiis currently the only species in the genus with a fully cleft telson.  Distribution. North-Eastern Indian Ocean. Cocos (Keeling) Islands(current study). 2008-10-08 AM J. K. Lowry & K. B. Attwood Cocos (Keeling) Islands Rumah Baru -12.156111 Indian Ocean 21 96.82806 West Island 5 122 P80192 1 holotype [406,664,1633,1652] AM 5 122 P80193 1 paratype AM 5 122 P80194 1 paratype [326,522,1659,1679] AM 5 122 P80532 1 paratype [533,730,1659,1679] AM 5 122 P80543 1 paratype AM 5 122 P80544 1 paratype [291,467,1685,1705] AM 5 122 P80549 1 paratype 2008-10-07 AM J. K. Lowry & L. E. Hughes & K. B. Attwood Cocos (Keeling) Islands West Island -12.084444 Indian Ocean 21 96.88167 Government House Beach 5 122 13 7 6 Cocos (Keeling) Islands Indian Ocean -12.156111 Rumah Baru 21 96.82806 West Island 5 122 1