Lucilina tilbrooki Milne, 1958

Sirenko, Boris I. & Zhang, Junlong, 2019, Chitons (Mollusca: Polyplacophora) of Hainan Island and vicinity, South China Sea, Zootaxa 4564 (1), pp. 1-40 : 18

Lucilina tilbrooki Milne, 1958

( Figs 13–15 )

Lucilina tilbrooki Milne 1958: 152 , figs 1–4; Kaas et al. 2006: 346, fig.145, map 51 (bibliography and synonymy); Dell’Angelo et al. 2010: 38, figs 2A–L, 3A–D, 4D–E; Sirenko 2012: 80, pl. 13 C, figs 21, 22. Tonicia (Lucilina) tilbrooki ; Kaas & Van Belle 1980: 133; 1998: 188.

Type material. Holotype NMV P18471.

Type locality. Queensland, Capricorn Group, Heron Island .

Material examined. South China Sea, Hainan Island, stn. 5, 19°38’12’’N, 111°01′52’’E, intertidal, on stones, 2 spms, BL 4.0–6.0 mm, 14.11.2016, leg. B. Sirenko; stn. 15, 18°12’09’’N, 109°29′40’’E, intertidal, on old corals, 1 spm, BL 3.0 mm, 19.11.2016, leg. B. Sirenko; stn. 27, 18°18′03’’N, 109°13′55’’E, depth 2–5 m, on stones covered with red crustose algae, 1 spm, BL 9.5 mm, 24.11.2016, leg. B. Sirenko.

Distribution. The species is known from Maldives Islands, South Vietnam, Hainan Island and Australia.

Remarks. The studied specimen (BL 5.0 mm) has a radula 1.5 mm long with 35 transverse rows of mature teeth and 20 gills extending from valve III to valve VII. The slit formula of this specimen is 8/1/10. This is the first record of L. tilbrooki from Hainan Island.

Figures

FIGURE 13. Lucilina tilbrooki, Hainan, BL 5.0 mm: A. Valve I, dorsal view; B. Valve II, dorsal view; C. Valve V, dorsal view; D. Valve VIII, dorsal view; E. Valve V detail of tegmentum in central and lateral areas; F. Valve V, rostral view; G. Valve VIII, lateral view.

FIGURE 14. Lucilina tilbrooki, Hainan, BL 5.0 mm: A. Dorsal and ventral scales; B. Dorsal and ventral scales and marginal spicules; C. Dorsal scales; D. Ventral scales in central part of girdle.

FIGURE 15. Lucilina tilbrooki, Hainan, BL 5.0 mm: A. Radula; B. Central and first lateral teeth of radula.