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Phylum Mollusca > Class Gastropoda > Family Neritidae
Dubious nerite snail
Clithon oualaniensis
Family Neritidae
updated Oct 2016

Where seen? This tiny snail is sometimes seen in large numbers on sandy shores near monsoon drains and other sources of freshwater on some of our shores, sometimes among seagrasses and seaweeds. It seems to prefer the upper reaches of monsoon drains leading to the sea or slow-moving, sheltered, shallow waters. The study by Tan & Clements (2008) found this snail on sandy banks of mangrove streams, on sand in drains and canals, intertidal muddy sand banks, and on mud in mangroves. Sites included: Sarimbun, Punggol, Pulau Ubin, Pasir Ris, Sungei Changi, Changi, Tanah Merah, Sungei Bedok, Marina East, Kallang and Tuas.

Features: 0.3-0.5cm. The spherical shell is thin with a semi-circular shell opening. Shell smooth, glossy, a plain yellow or olive background with delicate black lines in various designs; from simple lines to more complex patterns. It is said no two shells are identical. Operculum thin smooth horn-like material usually greyish. Body pale with fine black stripes, and long slender tentacles.

What does it eat? This tiny snail grazes on algae.

Status and threats: This beautiful snail is listed as 'Vulnerable' on the Red List of threatened animals of Singapore. According to the Singapore Red Data Book: "Populations along the original shores have been wiped out by reclamation."

Tuas, Nov 06

East Coast, Nov 08

Thin greyish operculum.
Tanah Merah, May 09

Striped body with long tentacles.
Tanah Merah, Oct 10

Striped body with long tentacles.
Tanah Merah, Dec 11

Egg cases laid on seagrass.
East Coast, Dec 08

Egg cases laid on seagrass.
Tanah Merah, Oct 10

Egg cases laid on one another!
Sentosa, Apr 09

Dubious nerite snails on Singapore shores

Photos of Dubious nerite snails for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Lazarus, Dec 08
Photo shared by Loh Kok Sheng on his blog.

Pulau Sudong, Dec 09
 

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