Plaxiphora bucklandnicksi Sirenko, 2012

(Fig. 4A)

Plaxiphora bucklandnicksi Sirenko2012: 88, pl. 13 D, E; figs 27; 28.

Plaxiphora sp.; Hasegawa et al. 2001: 3, pl. 1, fig. 1.

Type material. Holotype (ZISP 2177) and 10 paratypes (ZISP 2178). Type locality. South China Sea, off South Vietnam, Nhatrang Bay, Nok Island, 0 m. Material examined. South China Sea, Hainan Island, stn. 3, 20°09’36’’N, 110°41′17’’E, intertidal, on stones,

6 spms, BL 4.0–7.0 mm, 13.11.2016, leg. B. Sirenko; stn. 5, 19°38’12’’N, 111°01′52’’E, intertidal, on stones, 3 spms, BL 3.0–4.0 mm, 14.11.2016, leg. B. Sirenko; stn. 13, 18°12’09’’N, 109°29′40’’E, depth 2–3 m, on old corals, 2 spms, BL 4.0 mm, 19.11.2016, leg. B. Sirenko; stn. 14, 18°12’09’’N, 109°29′40’’E, intertidal pool, on stones, 1 spm, BL 4.0 mm, 19.11.2016, leg. B. Sirenko; stn. 22, 18°11’46’’N, 109°29’40’’E, depth 2 m, on old corals, 1 spm, BL 3.0 mm, 21.11.2016, leg. B. Sirenko; stn. 26, 18°11’46’’N, 109°29’40’’E, intertidal–1.5 m, on stones, 21 spms, BL 2.0–4.0 mm, 22.11.2016, leg. B. Sirenko, S. Grebelniy.

Distribution. Vietnam from the Gulf of Thailand to Danang, China, Hainan Island, mainly intertidal to 3 m depth.

Remarks. This is one of the abundant species of the intertidal zone which is difficult to find because of its small size and the rich fouling on the valves.