Amygdalum watsoni ( Smith, 1885:275 )

Lam, Katherine, Morton, Brian & Leung, K. F., 2008, Shell-bearing Mollusca (Bivalvia and Gastropoda) from submarine caves in Hong Kong, Journal of Natural History 42 (9 - 12), pp. 927-952 : 943-944

Amygdalum watsoni ( Smith, 1885:275)

Description

Shell thin, elongate, widened posteriorly. Shell exterior smooth and shiny, with fine concentric growth lines. Yellowish green to reddish brown. Shell interior lustrous white.

Type locality

‘‘ Challenger’ ’ Station 191, near Arrou Islands : 5 ° 419S., 134 ° 49300E., 800 fathoms; Station 207, West of Luzon, Philippines: 12 ° 219N., 122 ° 159E., 700 fathoms .

Distribution

Indo-Pacific ( Oliver 2001), Indian Ocean, Gulf of Oman, The Philippines, South and East China Seas, Beibu Gulf, Hong Kong, Hainan ( Bernard et al. 1993), Conic Island Cave (this study), Japan ( Higo et al. 1999). 20–100 m in mud and sand.

Family LUCINIDAE Fleming, 1828

Anodontia sp. [possibly A. bialata ( Pilsbry, 1895) ] (juvenile)

Description

Shell small, globose, thin, white with fine concentric growth striae. Anterior and posterior margins straight and short. Beak swollen, low, prosogyrous.

Distribution

Conic Island Cave, Hong Kong (this study).

Ctena sp. (juvenile) Mo"rch, 1861

Description

Shell small, circular and white. Fine concentric growth lines intersected with regular radial ribs.

Distribution

Steep Island Cave, Hong Kong (this study). The shell from Cape d’Aguilar sands figured as Codakia fibula by Morton and Harper (1997) is in fact a Ctena species.