Trapezia rufopunctata (Herbst, 1799)

Sun, Yu-Li, Jiang, Wei & Sha, Zhong-Li, 2024, Shallow-water Trapezioidea (Decapoda: Brachyura) from the South China Sea, including two new records, and notes on Tetralia glaberrima Herbst, 1790, Zootaxa 5476 (1), pp. 393-423 : 412-413

Trapezia rufopunctata (Herbst, 1799)

( Fig. 9C )

Cancer rufopunctatus Herbst, 1799: 54 , pl. 47 fig. 6.

Trapezia rufopunctata .— Serène 1984: 276, fig. 184, pl. 39 fig. A.— Jeng 1994: 317, fig. 7A, B ( Taiwan Island).— Castro 1997a: 90; 1997b: 127; 1999a: 54; 2009: 274, figs. 1F, 2A; 2011: 82.— Castro et al. 2004: 52 .— Liu et al. 2008: 792 (list) (Xisha Islands).— Higashiji 2013: 85, fig. 2D (Ryukyu Islands).— Poupin 2018: 41, fig. 13A ( Mayotte Island).

Grapsillus maculatus MacLeay, 1838: 67 .

Trapezia maculata .— Serène 1984: 277, pl. 39B.—Tsareva 1980: 119.

Trapezia acutifrons A. Milne-Edwards, 1867: 281

Trapezia rufopunctata f. typica Bouvier, 1915: 273.

Quadrella rufopunctata Chen, 1933: 111 , fig. 55.

Trapezia rufopunctata var. Maculata . —Guinot 1962: 240.

Material examined. Nansha Islands: Fiery Cross Reef, 112°58.9’E 9°39.5’N, 15 m, coll. Shaobo Ma, Yuli Sun, Ziming Yuan, 13 May 2022, 1 male (19.9 × 18.02 mm), 1 female (23.44 × 20.36 mm), 1 male (14.16 × 12.20 mm), NS-YS-2022-1098, in Pocillopora sp. ( Pocilloporidae ). — 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 female (20.94 × 18.65 mm), ZS-MB-2022-1004, in Pocillopora ( Pocilloporidae ).

Geographical distribution. Across Indo–West Pacific region ( Castro 2011).

Remarks. Trapezia rufopunctata is the largest species of the genus recorded in the South China Sea. The phylogenetic results show that this species is relatively distantly related to other species of Trapezia ( Fig. 11 ), and this is also reflected in its morphological features, such as its significantly larger body size and sharp frontal teeth.

Figures

FIGURE 9. A, Trapezia plana Ward, 1941, male (9.42 × 8.19 mm) (VX0302), Hainan Island; B, Trapezia plana, pre-adult (3.42 × 2.79 mm) (NS-MJ-2022-1750), Nansha Islands, Mischief Reef; C, Trapezia rufopunctata Herbst, 1799, male (19.18 × 18.18 mm) (NS-YS-2022-1098), Nansha Islands, Fiery Cross Reef; D, Trapezia septata Dana, 1852, female (12.63 × 10.51 mm) (NS-MJJ-2022-1050), Nansha Islands, Mischief Reef; E, Trapezia serènei Odinetz, 1983, male (5.36 × 4.78 mm) (XS-QL- 2022-1174), Xisha Islands, Seven Connected Islets.

FIGURE 11. Phylogenetic trees resolved by Bayesian analysis based on the sequences of COI. Nodal support values in the nodes correspond to Bayesian posterior probabilities (PP).