Shallow-water Trapezioidea (Decapoda: Brachyura) from the South China Sea, including two new records, and notes on Tetralia glaberrima Herbst, 1790 Author Sun, Yu-Li Qingdao Agricultural University, Qingdao, China. & Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. Author Jiang, Wei 0000-0003-4767-8196 Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. & Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. & Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao 266237, China jiangwei@qdio.ac.cn Author Sha, Zhong-Li Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. & Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. & Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao 266237, China text Zootaxa 2024 2024-07-04 5476 1 393 423 http://dx.doi.org/10.11646/zootaxa.5476.1.30 journal article 10.11646/zootaxa.5476.1.30 1175-5326 12681889 D5F945AF-65F2-4AB3-AE00-B4C9BC0CE8F3 Trapezia digitalis Latreille, 1828 ( Fig. 7D, E ) Trapezia digitalis Latreille, 1828: 696 .— Serène 1984: 277 , fig. 185, pl. 38D.— Castro 1997a: 78 , pl. 3B; 1997b: 120; 2009: 273; 2011: 80.— Galil 1987: 161 , fig. 2.— Castro et al. 2004: 50 .— Liu et al. 2008: 792 (list) (Hainan Island, Taiwan Island , the Xisha Islands).— Higashiji 2013: 87 , fig. 2F (Ryukyu Islands).— Limviriyakul 2016: 5 , fig. 4q ( Taiwan Island ).— Poupin 2018: 40, fig. 12J ( Mayotte Island ).— El-Sayed 2019: 49 (Red Sea). Trapezia leucodactyla Rüppell, 1830: 28 . Trapezia fusca Hombron & Jacquinot, 1852 , pl. 4, fig. 17-18.—Lucas, 1853, p. 45. Trapezia nigro-fusca Stimpson, 1860: 219 . Trapezia ferruginea var. digitalis Paulson, 1875: 49 , pl. 7, figs 5-6. Trapezia digitalis var. typica Borradaile, 1902: 265 . Grapsillus digitalis Rathbun, 1906: 866 . 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 (7.59 × 5.87 mm), NS-MJJ-2022-1047; 1 pre-adult (2.38 × 2.07 mm), NS- MJJ-2022-1106; 1 male (4.56 × 3.65 mm), NS-MJJ-2022-1107; 1 female (3.22 × 2.51 mm), NS-MJJ-2022-1108; 1 male (3.02 × 2.36 mm), NS-MJJ-2022-1109; 1 female (3.62 × 3.08 mm), NS-MJJ-2022-1110; 115°29.8’E 9°54.4’N , 13 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 6 May 2022 , 1 female (4.45 × 3.56 mm), NS-MJJ-2022-1316; 1 male (5.62 × 4.67 mmNS-MJJ-2022-1317); 115°31.3’E 9°52.6’N , 8 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 7 May 2022 , 1 male (4.56 × 3.53 mm), NS-MJJ-2022-1375; 115°33.8’E 9°52.9’N , 8 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 9 May 2022 , 1 pre-adult (2.32 × 1.75 mm), NS-MJ-2022-1616. Fiery Cross Reef , 112°58.6’E 9°38.7’N , 10 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 12 May 2022 , 1 female (4.51 × 3.54 mm), NS-YS-2022- 1012; 113°0.8’E 9°39.9’N , 10 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 14 May 2022 , 4 juveniles (3.34 × 2.67 mm; 3.68 × 2.70 mm; 3.41 × 2.53 mm; 2.10 × 1.82 mm), NS-YS-2022-1172; 1 male (4.69 × 3.90 mm), NS-MJJ-2022-1192; 4 pre-adults (3.08 × 2.59 mm; 2.27 × 1.98 mm; 2.54 × 1.88 mm; 2.55 × 1.95 mm), NS-YS-2022-1234. — Zhongsha Islands : Walker Shoal , 114°29.0’E 15°55.0’N , 15 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 17 May 2022 , 1 male (9.26 × 7.48 mm), 1 female (10.10 × 7.5 mm), ZS-MB-2022-1053; 17 m, coll. Wei Jiang , 6 May 2019 , 1 pre-adult (3.67 × 2.90 mm), ZS105C12. Shenhu Shoal , 17 m, coll. Wei Jiang , 5 July 2020 , 1 male (8.81 × 7.56 mm), ZS244C05; 20 m, 4 June 2021 , 1 male (12.72 × 9.90 mm), ZS2021C9. — Xisha Islands : Yongle Island , 111°44.3’E 16°33.0’N , 10 m, coll. Shaobo Ma , Yuli Sun , Ziming Yuan , 22 May 2022 , 1 female (4.51 × 3.54 mm), XS-YL-2022-1012); 1 pre-adult (2.68 × 1.96 mm), XS-YL-2002-1053. — Hainan Island : Jiajing Dao , coll. Wei Jiang , 28 March 2018 , 1 female (7.76 × 5.89 mm), 100-1026-1029. All found in Pocillopora sp. ( Pocilloporidae ) . Geographical distribution. Across Indo-West Pacific and Tropical Eastern Pacific regions ( Castro 2011 ). Remarks. Two color patterns of Trapezia digitalis are commonly observed in pre-adults: one is the same as the adult color, which is chocolate brown, and the other has a brown anterior half and a creamy white posterior half of the carapace ( Fig. 7E , NS-MJ-2022-1672).