Quadrisegmentum yirrgay, Hughes & Takeuchi, 2016

Hughes, Lauren Elizabeth & Takeuchi, Ichiro, 2016, Two New Species of Quadrisegmentum (Phtisicidae: Amphipoda: Crustacea) from the Central Indo-Pacific, with Notes on the Type Species Q. triangulum Hirayama, 1988, Records of the Australian Museum 68 (5), pp. 231-244 : 236-243

publication ID

https://doi.org/ 10.3853/j.2201-4349.68.2016.1663

persistent identifier

https://treatment.plazi.org/id/038D87EB-8208-FFE1-FCBD-FAA3FA84CFEF

treatment provided by

Carolina

scientific name

Quadrisegmentum yirrgay
status

sp. nov.

Quadrisegmentum yirrgay   sp. nov.

Figs 6–10 View Figure 6 View Figure 7 View Figure 8 View Figure 9 View Figure 10

Quadrisegmentum triangulum   . — Guerra-Garcia, 2003: 104–105, fig. 9a. — Guerra-Garcia, 2006: 440, fig. 39. —Guerra-Garcia & Lowry, 2009: 323–325.

Type material. Holotype ♂ 9.0 mm, AM P.98563, outer reef slope,Ashmore Reef , Coral Sea, Queensland, Australia (10°26'16"S 144°25'47"E), red calcareous cylindrical algae, 19 January 1993, coll. S.J. Keable ( QLD 704 ); paratype ♂ 9.0 mm, AM P.98564,outer reef slope,Ashmore Reef,Coral Sea, Queensland, Australia (10°26'16"S 144°25'47"E), red calcareous cylindrical algae, 19 January 1993, coll. S.J. Keable ( QLD 704 ); many specimens, AM P.61630, outer reef slope, Ashmore Reef, Coral Sea, Queensland, Australia (10°26'16"S 144°25'47"E), red calcareous cylindrical algae, 19 January 1993, coll. S.J.Keable ( QLD 704 ) GoogleMaps   . Paratypes: ♀, 6 mm, AM   P.61624,eastern edge of outer reef slope, Ashmore Reef , Coral Sea, Queensland, Australia (10°09'10"S 144°34'43"E) calcareous red tubular algae, 24 January 1993, coll. S.J. Keable ( QLD 734 ) GoogleMaps   ; 2 specimens (1 ♂ and 1 ♀), AM   P.61627, eastern edge of outer reef slope Ashmore Reef , Coral Sea, Queensland, Australia (10°09'10"S 144°34'43"E) mixed sponges, 24 January 1993, coll. S.J. Keable ( QLD 736 ) GoogleMaps   ; 4 specimens (2 ♂♂ and 2♀♀), AM   P.61629, outer reef slope, Ashmore Reef , Coral Sea, Queensland, Australia (10°13'10"S 144°24'53"E) sponges, 22 January 1993, coll. S.J. Keable ( QLD 722 ) GoogleMaps   ; 1 ♂, AM   P.61625, outer reef slope, Ashmore Reef , Coral Sea, Queensland, Australia (10°26'16"S 144°25'47"E) sediment, algae and rubble, 19 January 1993, coll S.J. Keable ( QLD 705 ) GoogleMaps   .

145°28'E), 2 m, mixed algae from bommie, 28 September 1978, coll. J.K. Lowry ( QLD 1 ); 2 specimens (1 ♂ and 1♀), AM   P.32314, off southern Point of Mermaid Cove, Lizard Island (14°39'S 145°27'E), 3–6.1 m, filamentous algae with stone washings and scrapings from crevices, 8 October 1978, coll. C. J. Short & P.C. Terrill (QLD–25); 1 ♀, AM GoogleMaps   P.32318, fringing reef between Bird Islet and South Island, Lizard Island (14°40'S 145°28'E), 25 m, green algae Halophila   sp. and mixed algae from grass beds off reef base, 9 October 1978, coll. J.K. Lowry ( QLD 29 ); 2 ♂♂, AM GoogleMaps   P.32320, reefs at western end of Blue Lagoon , Lizard Island (14°40'S 145°28'E), 3 m, sand near artificial reefs, 5 October 1978, coll. P.C. Terrill ( QLD 33 ); 16 specimens (6 ♂♂, 9 ♀♀, 1 juvenile), AM GoogleMaps   P.32325, Mermaid Cove , Lizard Island (14°40'S 145°28'E), subtidal to 2 m, mixed algae, coral rubble and silt, 14 October 1978, coll. J.K. Lowry (QLD–48); 1 ♀, AM GoogleMaps   P.32326, off North Point , Lizard Island (14°39'S 145°27'E), 3–6.1 m, red algae ( Galaxaura   sp.) and coral rubble from subtidal caves, 14 October 1978, coll. J.K. Lowry ( QLD 49 ); 9 specimens (7 ♂♂, 1 ♀, 1 juvenile), AM GoogleMaps   P.32327, off North Point , Lizard Island (14°39'S 145°27'E), 3–6.1 m, mixed algae, 14 October 1978, coll. J.K. Lowry ( QLD 50 ); 7 specimens (4 ♂♂ and 3 ♀♀), AM GoogleMaps   P.32328, Lizard Island , off North Point, Lizard Island (14°39'S 145°27'E), 6.1 m, green calcareous alga Halimeda   sp., 14 October 1978, coll. P.C. Terrill ( QLD 52 ); 1 ♂, AM GoogleMaps   P.61626, Great Barrier Reef , inside outer barrier, Lizard Island (10°34'29"S 143°55'17" E), 15 m, rubble, 16 January 1993, coll. S.J. Keable ( QLD 682 ); 1 ♂, AM GoogleMaps   P.61712, between Palfrey Island and Lizard Island , western side of Blue Lagoon, Lizard Island (14°41'S 145°27'E), 7 October 2001; 5 specimens (2♂♂ and 3 ♀♀), AM GoogleMaps   P.61713, between Palfrey Island and Lizard Island , western side of Blue Lagoon, Lizard Island (14°41'S 145°27'E), 7 October 2001; 1 ♀, AM GoogleMaps   P.61714, between Palfrey Island and Lizard Island , western side of Blue Lagoon, Lizard Island (14°41'S 145°27'E), 2–3 m, coral rubble, 7 October 2001, coll. J.M. Guerra-García & S.J. Keable ( QLD 1469 ); 8 specimens (4 ♂♂ and 4 ♀♀), AM GoogleMaps   P.61715, Coconut Beach , Lizard Island (14°41'S 145°27'E), 6 m, fine live hard coral encrusted with calcareous red algae and filamentous red/green/brown algal turf, 8 October 2001, coll. J.M. Guerra-García & S.J. Keable ( QLD 1476 ); 3 specimens (1 ♀ and 2 juveniles), AM GoogleMaps   P.61716, Crystal Beach , Lizard Island (14°41'S 145°27'E), 5 m, thick branching coral rubble encrusted with red algal turf and black sponge half buried in sediment, 9 October 2001, coll. J.M. Guerra-García & S.J. Keable ( QLD 1483 ); 1 juvenile, AM GoogleMaps   P.61717, Crystal Beach , Lizard Island (14°41'S 145°27'E), 4 m, thin branching live coral heavily encrusted Island (14°41'S 145°27'E), 25 m, gorgonian (cf. Menella   sp.), 14 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1544 ); 1 ♂, AM GoogleMaps   P.61724, reef slope on south side of South Island , Lizard Island (14°41'S 145°27'E), 20 m, gorgonian (cf. Mopsella   sp.), 14 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1545 ); 2 ♂♂, AM GoogleMaps   P.61725, north–east side of Lizard Island , reef slope south of "Washing Machine" (14°41'S 145°27'E), 18 m, brown sponge cf. Clathria reinwardti   , 16 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1565 ); 1 ♀, AM GoogleMaps   P.61726, north–east side of Lizard Island , reef slope south of "Washing Machine" (14°41'S 145°27'E), 6 m, green calcareous alga Halimeda macroloba   , 16 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1568 ); 1 ♀, AM GoogleMaps   P.61727, north–east side of Lizard Island , reef slope south of "Washing Machine" (14°41'S 145°27'E), 5 m, sediment with green alga Halimeda cylindracea Decaisne 1842   , Udotea   and Caulerpa   spp., 16 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1569 ); 2 specimens (1 ♂ and 1 juvenile), AM GoogleMaps   P.61728, north–east side of Lizard Island , reef slope south of "Washing Machine" (14°41'S 145°27'E), 6 m, mixed silty filamentous red algae and green alga Caulerpa taxifolia (M.Vahl) C. Agardh 1817   , 16 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1573 ); 1 ♂, AM GoogleMaps   P.61729, Pidgin Point , Lizard Island (14°41'S 145°27'E), 20 m, sponge cf. Clathria reinwardti   , 18 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1581 ); 1 ♂, AM GoogleMaps   P.61730, reef just south–west of Osprey Island , Lizard Island (14°41'S 145°27'E), 10–12 m, fine–medium sand with some shell, 18 October 2001, coll. J.M. Guerra-Garcia & S.J. Keable ( QLD 1588 ); 1 mature ♀, AM GoogleMaps   P.61731, Granite Bluff , Lizard Island (14°40'S 145°28'E), reef rock, 30 August 1976, coll. P.A. Hutchings (25–1); 4 ♂♂, AM GoogleMaps   P.61732, northern end of Mermaid Beach , Lizard Island (14°41'S 145°27'E), 4 m, brown alga Padina   sp., 12 October 2001, coll. J.M. Guerra- Garcia & S.J. Keable ( QLD 1533 ) GoogleMaps   .

Tasman Sea : 7 specimens (6 ♂♂ and 1 ♀), AM   P.61581, patch reef in lagoon, Middleton Reef , Elizabeth and Middleton Reefs (29°27'36"S 159°06'42"E), prolific coral cover on top of bommie, 6 December 1987 (Site 12); 1 ♂, AM GoogleMaps   P.61582, The Sound , large alcove near lagoon entrance, Middleton Reef , Elizabeth and Middleton Reefs (29°27'42"S 159°05'24"E), rubble wash, 5 December 1987 (Site 7); 1 ♂, AM GoogleMaps   P.61475, reef front south of North Passage , straight out from Signal Point, Lord Howe Island (31°31'36"S 159°03'E) coralline algae, coll. G.D. Fenwick, 11 May 1977 ( LHA 17 ) GoogleMaps   .

Papua New Guinea: ♂ 6.1 mm, whole animal SEM pin mount, AM P.97779, The Quarry , near the village of Bunu 2, Madang (4°46'30"S 145°48'E), coral slope with rubble, sand, ascidian Didemnum molle (Herdmann, 1886)   and sponges, 21 January 1990, coll. J.K. Lowry ( PNG 69); ♀ 6.1 mm, AM P.98565, The Quarry, near the village of Bunu 2, Madang (4°46'30"S 145°48'E), coral slope with rubble, sand, ascidian Didemnum molle   and sponges, 21 January 1990, coll. J.K. Lowry ( PNG 69); 3 specimens (2 ♂ and 1 mature ♀), AM P.61534, base of reef slope, outer face, Horseshoe Reef, Bootless Inlet (9°30'30"S 147°15'30"E) green calcareous alga Halimeda opuntia (Linnaeus) J.V. Lamouroux 1816   , 28 October 1980, coll. S.P. Arnam & J.K. Lowry (PNG-23); 1 mature ♀, AM P.61533, Horseshoe Reef, Bootless Inlet (9°30'30"S 147°15'30"E) coral rubble from reef front slope, 29 October 1980, coll. S.P. Arnam & J.K. Lowry (PNG-32); 1 ♂, AM P.61536, Horseshoe Reef, Port Moresby (9°36'30"S 147°17'54"E) gorgonian, 2 November 1980, coll. A.J. Bruce ( AJB 206 ); 4 specimens (3 ♂♂ and 1 damaged juvenile), AM P.61537, Lion Island , Manunouma Islands (9°32'17"S 147°06'13"E), gorgonian, 5 November 1980, coll. A.J. Bruce (AJB-208); 4 specimens (3 ♂♂ and 1 mature ♀), AM P.61535, outside Horseshoe Reef, Bootless Inlet (9°30'30"S 147°17'30"E), crinoids from outer reef face, 9 November 1980, coll. S.P. Arnam & J.K. Lowry (PNG-63); 74 specimens, AM P.61531, The Quarry, near the village of Bunu 2 (4°46'30"S 145°48'E), coral slope with rubble, sand, ascidian Didemnum molle   and sponges, 21 January 1990, coll. J.K. Lowry ( PNG 69); 1 ♂, AM P.61532, The Quarry, near the village of Bunu 2 (4°46'30"S 145°48'E), coral slope with rubble, sand and black sponge, coll. J.K. Lowry, 21 January 1990 ( PNG 68) GoogleMaps   .

Type locality. Ashmore Reef, off Great Barrier Reef, Coral Sea, Queensland, Australia (10°26'16"S 144°25'47"E). (The present “Ashmore Reef” is the different “ Ashmore Reef”, Timor Sea, north-west Western Australia , type locality for Q. triangulum   ) GoogleMaps  

Etymology. “Yirrgay” is the lost spoken language of a coastal indigenous group in Far North Queensland. Applied as a noun in apposition.

Description. (Based on holotype ♂, body length 9.0mm, AM P.98563 and male, body length, 6.1 mm, SEM AM P.97779 for abdomen).

Body Somites sub-slender. Head and pereonite 1 combined, completely fused, suture absent, with pair of apically truncate dorsodistal projections. Pereonite 2, with small acute anterolateral projection and larger acute mid lateral projection. Pereonite 3, with minute mid-lateral projection. Pereonites 4–6 without anterior or mid-lateral projections Pereon. Gnathopod 1 basis similar in length to ischium, merus and carpus combined; carpus subequal to merus length, posterior margin with slender setae; propodus triangular; palm defined by prominent, curved, bifid process with 2 apical robust setae; dactylus falcate, inner margin lined with setules. Gill 2 subovate, length 0.6× pereonite 2 length. Gnathopod 2 begins ⅓ along posterior margin of pereonite 2; basis length 1.4× pereonite 2 length, 2.1× ischium, merus and carpus combined; merus subrectangular, distally swollen (length 2× width), longer than to carpus; carpus subrectangular (length 2× width); propodus subovate, longer than wide (length 2.1× width); palm 60% of posterior margin, 3 proximal projections each with robust seta.

Gill 3 elongate, length 0.6× pereonite 3. Pereopod 3 basis longest, 0.4× pereopod 3 length; ischium 0.1× basis length; merus 0.7× basis length; carpus 0.25× basis length; propodus 1.1× carpus length with 2 large robust setae along palm, dactylus recurved. Gill 4 subequal to gill 3. Pereopod 4 shorter than pereopod 3, length 0.30× body; basis longest, 0.6× pereopod 3 length; ischium 0.25× basis length; merus 0.6× basis length; carpus 0.3× basis length; propodus longer than carpus, length 1.1× carpus with 4 large robust setae along palm; dactylus recurved.

Pereopod 5 article 1 length 0.9× article 2; article 2 longest, 1.1× article 3; dactylus recurved. Pereopod 6 basis longest, 0.37× pereopod 6 length; ischium 0.08× basis length; merus 0.6× basis length; carpus 0.33× basis length, anterior margin without robust setae; propodus 0.6× basis length, anterior margin with 4 groups of long robust setae (proximal group only with paired robust setae); dactylus recurved. Pereopod 7 0.8× pereopod 6; basis 0.27× pereopod 7 length; ischium 0.25× basis length; merus length subequal to basis; carpus 0.65× basis length, anterior margin with 1 robust seta; propodus 0.8× basis length, anterior margin with 3 groups of long robust setae (middle group only with paired robust setae) and distal small robust setae; dactylus recurved.

Pleon. Uropod 1 elongate, without setae (broken). Uropod 2 (broken). Telson   small, with a pair of setae (Based on SEM AM P.97779).

Female. (based on paratype AM P.61624). Pereonite 2 with small anterolateral and small acute mid-lateral projections. Pereonite 4 with rounded anterolateral projection. Antenna 1 long 0.75× body length; article 2 longest, 2× article 1 length; flagellum with 8 articles. Antenna 2 shorter than antenna 1; flagellum 4-articulated, length ½× antenna 1.

Remarks. See remarks for Q. atauro   sp. nov.

Distribution. Australia: Ashmore Reef, Coral Sea, Lizard Island (current study; Guerra-Garcia, 2006; Guerra-Garcia & Lowry, 2009). Lord Howe Island. ( Guerra-García, 2006). Elizabeth and Middleton Reef ( Guerra-García, 2006). Papua New Guinea: Motupore Island, Manunouma Islands, Port Morseby and Madang ( Guerra-García, 2003).

AM

Australian Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Caprellidae

Genus

Quadrisegmentum

Loc

Quadrisegmentum yirrgay

Hughes, Lauren Elizabeth & Takeuchi, Ichiro 2016
2016
Loc

Quadrisegmentum triangulum

Guerra-Garcia, J 2006: 440
Guerra-Garcia, J 2003: 104
2003