Cryptoplax oculata ( Quoy et Gaimard, 1835 )

Sirenko, Boris I. & Zhang, Junlong, 2019, Chitons (Mollusca: Polyplacophora) of Hainan Island and vicinity, South China Sea, Zootaxa 4564 (1), pp. 1-40 : 33-34

Cryptoplax oculata ( Quoy et Gaimard, 1835)

( Fig. 4G )

Chiton oculatus Quoy & Gaimard 1835: 410 , pl. 73, figs 37–38.

Cryptoplax oculatus ; Haddon 1886: 41, 42, pl. 1, fig. 10, pl. III, figs 10 a– 10 m; Pilsbry 1893: 55 –56, figs 1–5; Nierstrasz 1905: 74, 75, Taf. II, fig. 28, Taf. VI, figs 151–153; Ang 1967: 432 –435, pl. XX, figs 1–6, pl. XXI, figs 1–6; Schwabe 2007: 149 –153, figs 4 B, D, 5 B, D, F, 6 B, D, 7, 8 (reinstatement).

Cryptoplax larvaeformis ; Leloup 1940: 25 –30, fig. 8, pl. III, fig. 1; 1952: 53; Dawydoff 1952: 113; Kaas & Van Belle 1998: 134; Saito 2001: 23, fig. 3; Strack 2003: 15 (part., non Chiton larvaeformis Burrow, 1815 )

Cryptoplax oculata ; Huang & Xu 1964: 6; Ma 2004: 4, pl. 1, fig. I; Xu 2008: 458; Sirenko 2012: 104, pls. 15 D, E; 16 B; figs 37, 38; Saito 2017: 55, 738, pl. 11, fig. 5.

Type material. Neotype ( ZSM Mol 20062203), designated by Schwabe (2007).

Type locality. Indonesia, Irian Jaya, North side of Jeftsiep Island (0°21’51’’N, 130°17’46.8’’E), 2–3 m depth .

Material examined. South China Sea, Xisha Islands, 57–419, 1 spm, BL 32.0 mm, 09.041957; Hainan, Luhuitou, dead corals, intertidal, 1 spm, BL 51.5 mm, 25.03.1958, leg. O. Scarlato; Xincun, corals, 1 spm, BL 30.0 mm, 18.04.1958; Sanya, corals, 1 spm, BL 33.0 mm, 31.04.1958. Xinying, rocks, intertidal, 1 spm, BL 62.0 mm, 10.05.1958.

Distribution. The species is distributed in the South China Sea along coast of Vietnam from Phu Quy Island to Dat Island, near Hainan and Xisha Islands, near Okinawa Islands, Indonesia and Philippines from intertidal zone up to 8.0 m depth.

Remarks. Since Kaas & Van Belle (1980), this species had been considered as junior synonym of C. larvaeformis until Schwabe (2007) designated a neotype and published a detailed redescription of C. oculata . The latter species can easily be distinguished from C. larvaeformis and other species of the genus Cryptoplax by having a black ring of spicules around the first three valves.

Figures

FIGURE 4. Complete specimens of species of genera Plaxiphora, Placiphorella, Acanthochitona, and Cryptoplax: A. Plaxiphora bucklandnicksi, Hainan Island, Sanya, stn 13, BL 5.0 mm; B. Placiphorella stimpsoni, Hainan Island, Sanya, BL 23.0 mm; C. Acanthochitona britayevi, Hainan Island, Xincun, BL 8.0 mm; D. Acanthochitona intermedia, Xisha Islands, MBM 100328 BL 11.0 mm; E. Acanthochitona lanae, Hainan Island, stn 1 BL 5.0 mm; F. Cryptoplax larvaeformis, Xisha Islands, 57-419, BL 35.0 mm; G. Cryptoplax oculata, Xisha Islands, 57-419, BL 35.0 mm.