Quadrisegmentum atauro Hughes &amp; Takeuchi 2016, sp. nov.
Creators: name: Hughes, Lauren Elizabeth
name: Takeuchi, Ichiro
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Caprellidae
Quadrisegmentum
Quadrisegmentum atauro

description: <i>Quadrisegmentum atauro</i> sp. nov. Figs 1–4 <b>Type material</b>. Holotype ♂, 10.5 mm (illustrated), dissected in part, 1 slide, AM P.98327, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); paratype ♀, 9 mm (illustrated), AM P.98328, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087). Paratypes: 1 ♂, 5.1 mm [a smaller specimen has been chosen for SEM as it is in better condition], whole animal SEM pin mount, AM P.91095, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012,coll. L.E. Hughes (TM 2012-087); 1 ♂, 10.5 mm, SEM pin mount, AM P.91091, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); 3 ♂♂, AM P.91097, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); 1 ♂, AM P.91092, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); 1 mature ♀, AM P.91096, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); many specimens, AM P.91094, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); 4 mature ♀♀, AM P.91093, Timor-Leste, east of Atauro Island, Outer Reef, dense coral reef slope (8°13'48"S 125°36'57"E), 17 m, green calcareous alga <i>Halimeda</i> sp., 20 September 2012, coll. L.E. Hughes (TM 2012-087); 7 specimens (6 ♂♂ and 1 mature ♀), AM P.91090, Timor-Leste, east of Atauro Island, Inner Reef, reef slope (8°14'30"S 125°36'49"E), 14 m, mixed turfing algae, 20 September 2012, coll. L.E. Hughes (TM 2012-034); 1 mature ♀, AM P.91099, Timor-Leste, west of Dili, off Tibar, on outer side of reef, rubble and sandy reef slope (8°33'48"S 125°28'31"E), 10–12 m, coral rubble and mixed algae, 21 September 2012, coll. A. Murray (TM 2012-037); 9 specimens (5 ♂♂ and 4 mature ♀♀), AM P.91098, Timor-Leste, east of Metinaro, Secret Garden Reef (8°29'15"S 125°49'53"E), 20 m, tufts of red algae, 22 September 2012, coll. L.E. Hughes (TM 2012-060). <b>Type locality</b>. Timor-Leste, east of Atauro Island, Outer Reef (8°13'48"S 125°36'57"E). <b>Etymology</b>. Named from the type locality, applied as a noun in apposition. <b>Description</b>. (Based on male, body length, 10.5 mm, AM P. 98327, and male, body length, 10.5 mm, AM P.91901 for pereopod 5 and abdomen). <b>Body</b> <i>Somites</i> slender. <i>Head and pereonite</i> 1 combined, completely fused, suture absent. <i>Pereonite 2</i> with small acute anterolateral projection. <i>Pereonites 3–6</i> without anterior or mid-lateral projections. <i>Antenna 1</i> ⅓× body length; peduncle article 2 longest, 1.9× article 1; article 3 length 0.8× article 2; flagellum length 0.24× peduncle with 4–6 articles (left and right, respectively). <i>Antenna 2</i> 0.9× Antenna 1; flagellum, 0.25× peduncle length, body with 8–9 articles (left and right, respectively). <i>Mandible</i> right similar to left, incisor with 4 teeth, lacinia mobilis with 7 teeth followed by 2 plates; palp 3-articulate; article 2 longest, with 1 distal slender setae; article 3 with 1 distal and 1 midlateral slender setae, anterodistal margin pubescent. <i>Mandible</i> left, palp similar to right palp. <i>Lower lip</i> setose on outer lobe. <i>Maxilla 1</i> outer plate with 5–6 robust setae; palp 2-articulate, article 2 with 2 triangular projections, each with a robust seta, with 3–4 subapical slender setae. <i>Maxilla 2</i> inner plate short with 4 robust setae; outer plate long, with 4 apical and 1 subapical robust setae. <i>Maxilliped</i> basal endite (inner plate) larger than ischial endite (outer plate), rectangular, with 4 apically robust setae near distal margin; ischial endite (outer plate) several slender setae on inner margin; palp 4-articulate; article 2 laterally expanded, with 3–4 slender setae; article 3 with rounded distal projection with 2 setae. <b>Pereon</b>. <i>Gnathopod 1</i> basis similar in length to ischium, merus and carpus combined; carpus and merus subequal in length with anterior and posterior slender setae; propodus triangular; palm defined by prominent, curved, bifid process with 2 apical robust setae; dactylus falcate, inner margin lined with setules. <i>Gill 2</i> elongate, length 5× width, 0.6× pereonite 2 length. <i>Gnathopod 2</i> begins ⅓ along posterior margin of pereonite 2; basis length 1.9× pereonite 2 length, 1.6× ischium, merus and carpus combined; merus subrectangular, distally swollen (length 2.8× width), subequal to carpus; carpus subrectangular (length 3.1× width); propodus subovate, longer than wide (length 2.8× width); palm 60% of posterior margin, 3 proximal projections each with robust seta. <i>Gill 3</i> slender, 7× width, length 0.9× pereonite 3 length. <i>Pereopod 3</i> length 0.3× body length; basis longest, 0.4× pereopod 3 length; ischium 0.1× basis length; merus 0.6× basis length; carpus 0.27× basis length; propodus 0.9× carpus length with 3 large and 1 small robust setae along palm; dactylus recurved. <i>Gill 4</i> subequal to gill 3. <i>Pereopod 4</i> shorter than pereopod 3, length 0.35× body length; basis longest, 0.4× pereopod length; ischium 0.06× basis length; merus 0.65× basis length; carpus 0.3× basis length; propodus shorter than carpus, length 0.9× carpus with 3 large and 1 small robust setae along palm; dactylus recurved. <i>Pereopod 5</i> with 4 articles; article 1 length 0.9× article 2; article 2 longest, 1.1× article 3; dactylus recurved. <i>Pereopod 6</i> slender, 0.5× body length; basis longest, 0.37× pereopod 6 length; ischium 0.08× basis length; merus 0.7× basis length; carpus 0.33× basis length, anterior margin with 2 robust setae; propodus 0.6× 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. <i>Pereopod 7</i> slender, smaller than pereopod 6, 0.4× body length; basis 0.27× pereopod 7 length; ischium 0.25× basis length; merus length subequal to basis; carpus 0.65× basis length, anterior margin with 2 robust setae; 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. <b>Pleon</b>. <i>Uropod 1</i> elongate (length 6× width), with minute a line of lateral setae; ramus damaged. <i>Uropod 2</i> peduncle elongate (length 2.5× width), with a line of lateral setae; ramus 0.6× peduncle length. <i>Telson</i> small, with a pair of setae. <b>Female</b>. (based on female paratype, body length 9 mm, AM P. 98328). Pereonite 4 without rounded anterolateral projection. <i>Antenna 1</i> article 2 subequal to article 3 length, 1.8× article 1 length; flagellum with 10 articles. <i>Antenna 2</i> near 2/3 length of antenna 1; flagellum 0.6× peduncle length with 7 articles. <b>Remarks</b>. <i>Quadrisegmentum atauro</i> sp. nov. and <i>Q. yirrgay</i> sp. nov. have long rectilinear gills which separates them from <i>Q. triangulum</i> where the gills are much shorter and subovate. The pereonite 2 in <i>Q. atauro</i> sp. nov. has on one pair of acute anterior lateral projections which are not seen for <i>Q. yirrgay</i> sp. nov. and <i>Q. lowryi</i> Guerra-García, 2006. <b>Distribution</b>. Timor-Leste: Atauro Island, Tibar (current study).
description: Published as part of <i>Hughes, Lauren Elizabeth &amp; 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, pp. 231-244 in Records of the Australian Museum 68 (5)</i> on pages 232-236, DOI: 10.3853/j.2201-4349.68.2016.1663, http://zenodo.org/record/4676871
description: {"references": ["Guerra-Garcia, J. M. 2006. Caprellidae (Crustacea: Amphipoda) from the Great Barrier Reef and adjacent localities. Records of the Australian Museum 58 (3): 417 - 458. http: // dx. doi. org / 10.3853 / j. 0067 - 1975.58.2006.1451"]}