Rhyssoplax komaiana (Is. & Iw. Taki, 1929)

(Fig. 2E)

Chiton komaianus Is. & Iw. Taki 1929: 145, figs 22–31, pl. 2, fig. 6. Chiton (Rhyssoplax) venusta; Leloup 1952: 56, text-fig. 19, pl. 5, fig. 1, pl. 6, fig. 2 (non Chiton venusta Hull, 1923). Rhyssoplax komaiana; Is. Taki 1962: 45: Iw. Taki 1964b: 411; Bullock & Harper 1994: 39, pls. 4 B, 6 C, 7 C–D, 8B; Saito

1998: 154; 2000: 19, pl. 9, fig. 2; 2017: 50, 734, pl. 6, fig. 9; Hasegawa et al. 2001: 3; Sirenko 2012: 69, pl. 12 E; figs 12,

13. Chiton (Rhyssoplax) komaianus; Kaas & Van Belle 1980: 70; 1998: 104; Kaas et al. 2006: 200–203, fig. 79, map 36

(bibliography and synonymy).

Type material. Kaas et al. (2006) reported that the type is in ZICS, but we did not find this institute or type . Type locality. Japan, Prov. Kii (Wakayama Prefecture), Seto. Material examined. South China Sea, Hainan Island. 57-1051, 1 spm, BL 12 mm; stn. 4, 19°38’12’’N ,

111°01’52’’E, intertidal pool, on rocks, 6 spms, BL 3.0–6.0 mm, 14.11.2016, leg. B. Sirenko; stn. 6, 19°38’12’’N,

111°01′52’’E, depth 2–3 m, on stones, 1 spm, BL 16.0 mm, 14.11.2016, leg. B. Sirenko; stn. 10, 18°23’17’’N, 109°21’59’’E, SCUBA, depth 2–3 m, on stones, 1 spm, BL 5.0 mm, 17.11.2016, leg. B. Sirenko; stn. 13, 18°12’09’’N, 109°29’40’’E, depth 1–3 m, on stones and old corals, 2 spms, BL 3.0–10.0 mm, 15.11.2016, leg. B. Sirenko; stn. 16, 18°12’09’’N, 109°29′40’’E, depth 2–3 m, in sand, 3 intermediate valves, 19.11.2016, leg. B. Sirenko; stn. 17, 18°16’30’’N, 109°43’26’’E, SCUBA depth 3–4 m, on stones, 1 spm, BL 3.0 mm, 20.11.2016, leg. B. Sirenko; stn. 26, 18°11’46’’N, 109°29’40’’E, intertidal–1.5 m, on stones, 4 spms, BL 5.0–28.0 mm, 15.11.2016, leg. B. Sirenko, S. Grebelniy.

Distribution. Hong Kong, Hainan Island and South Vietnam, South Japan. Bullock (1988) states that it lives in Malaya, Philippines and possibly south of the Admiralty Islands as well.

Remarks. Rhyssoplax komaiana is one of the abundant chitons of Hainan Island.