Rhyssoplax venusta Hull, 1923

Sirenko, Boris I., 2019, New chitons (Mollusca: Polyplacophora) of the genera Rhyssoplax, Lucilina and Onithochiton from shallow waters of Papua New Guinea, The Bulletin of the Russian Far East Malacological Society 23 (1 / 2), pp. 63-81 : 65

Rhyssoplax venusta Hull, 1923

Figs. 1 , 2 , 12B

Rhyssoplax venusta Hull, 1923, p. 165 , pl. 26, figs. 1–4, 9–12; Iredale, Hull, 1926, p. 179, 180, pl. 19, figs. 28–35, 37; Dawydoff, 1952, p. 113; Sirenko, 2012, p. 71, pl. 12F; figs. 16, 17; Sirenko, 2019, p. 8, fig. 2F.

Chiton (Rhyssoplax) venusta ( Hull, 1923) : Leloup, 1952, p. 56, text-fig. 19, pl. 5, fig. 1, pl. 6, fig. 2.

Chiton (Rhyssoplax) venustus ( Hull, 1923) : Kaas, Van Belle, 1980, p. 139; Kaas, Van Belle, 1998, p. 196; Kaas et al., 2006, p. 229, fig. 92, map 37 (bibliography and synonymy).

Ty p e m a t e r i a l. Holotype ( AM C.49545) and two paratypes ( AM C.170744).

Ty p e l o c a l i t y. Queensland, Keppel Bay, Emu Park.

M a t e r i a l e x a m i n e d. Papua New Guinea, Bismarck Archipelago, Manus Island, Silver Sound , 02°01′ S, 146°53′ E, R / V Dmitriy Mendeleev, 18 cruise, sample 4, 1 m, 1 spm, BL 14 mm ( ZISP 2302 ), 27.01.1977 .

D i s t r i b u t i o n. This species is widely distributed in the western Pacific and was found in north-eastern Queensland , Papua New Guinea, Vietnam and Guangxi Province of southern China. It is first find of the species near Papua New Guinea. The species lives near Vietnam and southern China at depth from 0 to 20 m.

R e m a r k s. The studied specimen was damaged. All its features (shell, armature of girdle and head of major lateral teeth of radula match the original description and the drawings of Hull [1923]. Slit formula of this specimen is 8/1/15.

Figures

Fig. 1. Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm. A – head valve, dorsal view; B – valve V, dorsal view; C – tail valve, dorsal view; D – valve IV, ventral view; E – surface of tegmentum in central and lateral areas; F – tail valve, lateral view; G – valve V, rostral view.

Fig. 2. Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm. A – dorsal scales; B – ventral spicules near margin; C – ventral spicules, in middle; D – heads of major lateral teeth.

Fig. 12. Color images of species of genera Onithochiton, Rhyssoplax and Lucilina. A – Onithochiton maklayi, holotype (ZISP 2305), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 36.0 mm; B – Rhyssoplax venusta (ZISP 2302), Papua New Guinea, Bismarck Archipelago, Manus Island, 1 m, BL 14 mm; C – Lucilina insueta, holotype (ZISP 2303), Papua New Guinea, Astrolabe Bay, Bilibili Island, intertidal, rocks, BL 20 mm.