Linnaeus, 1758 : 779 Okutani 2000 : 102 Thach 2005 : 36 Poppe 2008a : 274 Tan & Clements 2008 : 487 Zvonareva et al . 2015 : 8 Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam Zvonareva, Sofya Kantor, Yuri Zootaxa 2016 4162 3 401 437  Linnaeus, 1758 : 779 Linnaeus, 1758 Linnaeus 1758 [151,515,1029,1055] Gastropoda Neritidae Nerita Animalia Cycloneritimorpha 7 408 Mollusca species undata     Nerita undata  Linnaeus, 1758: 779.    Nerita( Nerita) undata:  Okutani 2000: 102–103, pl. 51, fig. 5;  Thach 2005: 36, pl. 6, figs 33–34.  Nerita undata:  Poppe 2008a: 274–275, pl. 82, fig. 10;  Tan & Clements 2008: 487, figs 3-21, 3-22;  Zvonareva et al. 2015: 8.     Materialexamined. Dam Bay, natural mangrove, about 10 specimens.  Abundance.Uncommon.   Measurements.Up to 33 mm( Tan & Clements 2008).  Ecological notes.Development with free swimming veliger ( Fukumori & Kano 2014). Found in crevices and under rocks of breakwaters and rocky shores of middle to upper intertidal zones. Nocturnal, emerging from their hiding places at dusk ( Tan & Clements 2008). In studied sites it was found on rocks in the lower intertidal zone.  Relation to mangroves.Eurybiotic.   Distribution in Vietnam.From northern-east coast to southern delta ( Thach 2005).  General distribution.IWP: northeastern South Africato Kenya, ranging through central region, including Indonesiaand the Philippines, to Melanesia and Micronesia, southern Japanto northern Australia( Frey 2010). 1306554440 [151,949,1263,1288] Material Dam Bay 7 408 10