Chitons (Mollusca: Polyplacophora) of Hainan Island and vicinity, South China Sea Author Sirenko, Boris I. Author Zhang, Junlong text Zootaxa 2019 2019-03-05 4564 1 1 40 journal article 28483 10.11646/zootaxa.4564.1.1 e6d54a30-c8bf-488e-ba81-28cf160f0954 1175-5326 2588445 0B4DE937-0E27-427A-97CA-F7F2366420E9 Leptoplax doederleini ( Thiele, 1909 ) ( Figs 19–21 ) Notoplax döderleini Thiele 1909 : 39 , pl. 5, figs 32–38; Kaas & Van Belle 1980 : 40 ; 1998: 64; Xu 2008 : 458 . Notoplax (Notoplax) doederleini ; Van Belle 1982 : 478 , fig. 4. “ Notoplax ” doederleini ; Saito 1998 : 160 , fig. 2N; 2000a: 102. Leptoplax doederleini ; Saito 2000: 21, pl. 10, fig. 6; 2001: 200, fig. 14; 2006: 217; 2017: 54, 737, pl. 10, fig.8; Sirenko & Saito 2017 : 460, figs 9–12, 43D. Type material. Holotype ZMB Moll. 102017 . FIGURE 19. Leptoplax doederleini , Hainan, Xincun, BL 10.5 mm: A. Valve I, dorsal view; B. Valve II, dorsal view; C. Valve V, dorsal view; D. Valve VIII, dorsal view; E. Valve IV, ventral view; F. Valve V detail of tegmentum in plurolateral and jugal areas; G. Valve V, rostral view; H. Valve VIII, lateral view. FIGURE 20. Leptoplax doederleini , Hainan, Xincun, BL 10.5 mm: A. Valve VIII, view from behind; B. Marginal needles; C. Dorsal spicules and dorsal and marginal needles; D. Needles in tufts. Type locality. Kajiyama (=? Katsuyama , Tokyo Bay ), Japan . Material examined. South China Sea, Hainan , Xincun, corals and Zostera sp., 0.5 m, 1 spm, BL 10.5 mm, 21.04.1958 . Distribution. From Pacific coast of central Japan to Okinawa , Hong Kong , Hainan and northern Vietnam , 0– 20 m . Remarks. Van Belle (1982) reported this species from Hong Kong for the first time. Specimens from Hainan ( Fig. 20D , this study) and from Vietnam ( Fig. 11 , Sirenko & Saito 2017 ) differ from specimen from specimens from Hong Kong ( Fig. 4 , Van Belle 1982 ) by the shape of the central tooth of the radula. The studied specimen (BL 10.5 mm) has a radula that is 3.5 mm long with 37 transverse rows of mature teeth and 11gills extended from valve V to valve VII. Slit formula of this specimen is 5/1/8.