Polinices mammilla (Linnaeus, 1758)

Figs 7 E–F.

Nerita mammilla Linnaeus, 1758 .

Polinices mammilla: Okutani 2000: 252 –253, pl. 126, fig 17, Thach 2005: 87, pl. 26, fig. 23.

Material examined. Dam Bay, mangrove plantation, 1 specimen.

Abundance. Rare.

Measurements. Up to 40 mm (Okutani 2000).

Ecological notes. Found on fine sand bottom in subtidal zone (Okutani 2000). In studied sites it was found on mud surface in the lower intertidal zone.

Relation to mangroves. Eurybiotic.

Distribution in Vietnam. Central coast (Thach 2005).

General distribution. From Japan to tropical IWP (Okutani 2000).