Trapezia septata Dana, 1852

(Fig. 9D)

Trapezia septata Dana, 1852: 260 .— Galil & Lewinsohn 1985: 288, figs. 2, 5, 6.— Castro 1997a: 90, pls. 2E, 6; 1999a: 54; 2002: 364; 2009: 275, figs. 2C.— Castro et al. 2004: 53.— Liu et al. 2008: 792 (list) (Hainan Island, Taiwan Island, the Xisha Islands).— Higashiji 2013: 85, fig. 2C (Ryukyu Islands).— Limviriyakul 2016: 5, fig. 4s (Taiwan Island).— Boyko 2017: 491, fig. 1E (Easter Island).

Trapezia areolata .— Heller, 1865: 25; Kossmann, 1877: 44.—De Man, 1887: 317. —Henderson, 1893: 366.—Ortmann, 1893: 485 (part).—De Man, 1895: 556.—De Man, 1903: 640.—Miyake, 1936: 509.—Estampador, 1937: 531.—Ward, 1939: 12.—Serene, 1969: 147 (in key).—Garth, 1971: 198.—Garth, 1974: 401.—Patton, 1976: 18.—Austin & Sale 1980: 167.

Trapezia areolata inermis A. Milne-Edwards 1873: 259, pl. × fig. 6.

Trapezia reticulata Stimpson, 1858: 37 .— Odinetz, 1984: 444, figs 3D, 3d, 4D.— Dai & Yang 1986: 355, pl. 51(5), fig. 185(3).

Material examined. Nansha Islands: Mischief Reef, 115°32.5’E 9°55.7’N, 11 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 5 May 2022, 1 female (12.63 × 10.51 mm), NS-MJJ-2022-1050; 1 female (11.23 × 9.26 mm), NS- MJJ-2022-1061; 1 male (10.99 × 8.78 mm), NS-MJJ-2022-1062; 1 male (7.45 × 6.55 mm), NS-MJJ-2022-1063; 1 male (12.05 × 10.11 mm), NS-MJJ-2022-1066; 1 male (11.48 × 10.02 mm), NS-MJJ-2022-1069; 1 pre-adult (3.89 × 3.22 mm), NS-MJJ-2022-1075; 1 female (12.56 × 10.56 mm), NS-MJJ-2022-1081; 1 male (11.88 × 10.44 mm), NS-MJJ-2022-1082; 1 pre-adult (4.59 × 3.85 mm), NS-MJJ-2022-1115; 1 pre-adult (3.58 × 2.84 mm), NS-MJJ-2022-1116; 1 pre-adult (3.30 × 2.64 mm), NS-MJJ-2022-1117; 115°29.8’E 9°54.4’N, 13 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 6 May 2022, 1 male (8.35 × 7.22 mm), NS-MJJ-2022-1312; 1 female (10.21 × 8.68 mm), NS- MJJ-2022-1313; 1 male (5.62 × 4.63 mm), NS-MJJ-2022-1326; 1 female (2.54 × 2.12 mm), NS-MJJ-2022-1360; 1 female (7.32 × 6.39 mm), NS-MJJ-2022-1376; 1 female (6.06 × 5.23 mm), NS-MJJ-2022-1377; 1 female (4.35 × 3.83 mm), NS-MJJ-2022-1378; 115°33.8’E 9°52.9’N, 8 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 9 May 2022, 1 male (6.51 × 5.33 mm), 1 female (10.91 × 9.6 mm), NS-MJ-2022-1607; 1 male (4.22 × 3.46 mm), 1 female (5.88 × 5.08 mm), NS-MJ-2022-1620; 1 pre-adult (2.69 × 2.37 mm), NS-MJ-2022-1626; 1 pre-adult (2.59 × 2.32 mm), NS-MJ-2022-1631, in Seriatopora hystrix ( Pocilloporidae); 1 female (5.53 × 4.72 mm), NS-MJ-2022-1638; 1 male (4.48 × 3.85 mm), NS-MJ-2022-1667; 1 pre-adult (6.95 × 6.26 mm), NS-MJ-2022-1708; 115°34.4’E 9°53.5’N, 10 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 10 May 2022, 1 pre-adult (5.27 × 4.55 mm), NS-MJ-2022-1745; 5 pre-adults (3.80 × 3.13 mm; 2.81 × 2.29 mm; 3.08 × 2.50 mm; 2.38 × 2.15 mm; 2.79 × 2.55 mm), NS-MJ-2022-1749; 6 pre-adults (3.83 × 2.97 mm; 3.12 × 2.86 mm; 2.54 × 2.16 mm; 2.64 × 2.02 mm; 2.40 × 1.84 mm; 2.33 × 1.76 mm), NS-MJ-2022-1800; 1 pre-adult (2.79 × 2.55 mm), NS-MJ-2022-1827, in almost dead Pocillopora ( Pocilloporidae). Fiery Cross Reef, 112°58.6’E 9°38.7’N, 12 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 12 May 2022, 1 male (8.25 × 7.15 mm), NS-YS-2022-1013; 1 male (8.77 × 7.60 mm), NS-YS-2022-1038; 113°0.8’E 9°39.9’N, 10 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 14 May 2022, 1 pre-adult (3.11 × 2.64 mm), NS-YS-2022-1174; 1 pre-adult (3.06 × 2.57 mm), NS-YS-2022-1231; 1 male, 1 male (5.93 × 4.70 mm), NS-YS-2022-1285, in partially dead Acropora ( Acroporidae).— Zhongsha Islands: Margesson Shoal, 114°38.7’E 15°55.3’N, 20 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 17 May 2022, 1 male (5.28 × 4.32 mm), ZS-NF-2022-1013. Walker Shoal, 114°29.0’E 15°55.0’N, 15 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 17 May 2022, 1 male (7.89 × 6.45 mm), 1 female (8.05 × 6.58 mm), ZS-MB-2022-1002; 1 female (7.76 × 6.39 mm), 1 pre-adult (4.69 × 4.01 mm), ZS-MB-2022-1021. Shenhu Shoal, 17 m, coll. Geng Qin, Wein Jiang, 14 May 2019, 1 pre-adult (4.29 × 3.92 mm), ZS102C01; 113°0.7’E 19°30.3’N, 17 m, 5 July 2020, 1 male (9.14 × 7.45 mm), 1 female (9.59 × 7.98 mm), ZSS244C06.— Xisha Islands: The Seven Connected Islets, 112°16.2’E 16°58.0’N, 10 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 19 May 2022, 1 male (6.84 × 5.87 mm), 1 female (7.48 × 6.30mm), XS-QL-2022-1070; 112°19.6’E 16°57.1’N, 10 m, 21 May 2022, 1 male (8.45 × 7.45 mm), 1 female (9.99 × 7.88 mm), XS-QL-2022-1072; 1 male (6.81 × 5.70 mm), 1 female (7.81 × 6.74 mm), XS-QL-2022-1168. North island, 16°58’N 112°19’E, 10 m, coll. Shaobo Ma, Nov. 2020, 1 male (6.60 × 5.65 mm), XSBD 02. Yuzhuo Reef, 112°06’E 16°22’N, 2–3 m, coll. Wei Jiang, 9 July 2017, 1 male (5.45 × 4.66 mm), YZ01; 1 male (9.15 × 8.25 mm), YZ02.— Hainan Island: Hou Hai, 2–3 m, coll. Shenghui Hu, 20 October 2021, 2 males (8.12 × 7.45 mm; 4.42 × 3.78 mm), 2 females (8.95 × 7.74 mm; 4.12 × 3.56 mm), SY71. Fenghuang Dao, 3 m, coll. Yitang Xu, 15 August 2021, 1 male (6.97 × 5.97 mm), SY31. Xiaodong Hai, 3 m, coll. Lecheng Qu, 1 male (11.22 × 9.70 mm), SY42. Found in Pocillopora ( Pocilloporidae) unless otherwise noted.

Geographical distribution. Indian Ocean east of Sri Lanka and western and central Pacific Ocean to the Marshall Islands and Samoa (Castro et al. 2004).

Remarks. Trapezia septata is a relatively common coral symbionts in the South China Sea.