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Phylum Mollusca > Class Gastropoda > Family Neritidae
Red-mouth nerite snail
Neritina violacea
Family Neritidae
updated Sep 2020
Where seen? This sturdy nerite is sometimes seen in back mangroves and among mud lobster mounds. The study by Tan & Clements (2008) found this snail on our Northern shores as well as at Berlayar Creek. It was previously known as Dostia violacea.

Features: About 2cm. Shell thick heavy, oval with a sunken spire. When alive, the shell is covered with a 'skin' (periostracum) and usually covered with silt and algae. The shell pattern is actually pale with fine purplish bands and 'tent' markings. The flat underside may range from whitish with an orange tinge to bright brick red. Often with a narrow dark rim. The straight edge at the shell opening may have no 'teeth' or some tiny ones in the centre part. Operculum thick, smooth similar in colour with the underside with dark partches and blotches. Body said to be orange with black patches but those seen were pale with dark spots and a black foot.

Sometimes mistaken for the Black-mouth nerite (Neritina cornocupia) which has the same shell shape but has a black mouth.

Side view.
Mandai, Mar 11

Mandai, Mar 11

Animal emerging from the shell.
Mandai, Mar 11

Red-mouth nerite snails on Singapore shores
On wildsingapore flickr

Links References
  • Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist of The Molluscs of Singapore (pdf), Raffles Museum of Biodiversity Research, National University of Singapore.
  • Tan, S.K. & Clements, R. (2008) Taxonomy and distribution of the Neritidae (Mollusca: Gastropoda) on Singapore. Zoological Studies 47(4): 481-494.
  • Tan, K. S. & L. M. Chou, 2000. A Guide to the Common Seashells of Singapore. Singapore Science Centre. 160 pp.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
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