shelled snails text index | photo index
Phylum Mollusca > Class Gastropoda > Family Littorinidae
Round periwinkle snail
Echinolittorina sp.
Family Littorinidae
updated Aug 2020

Where seen? This little snail with an almost spherical shell is seen on some of our rocky shores. Usually near the high water mark on large boulders. Usually in small numbers, and often among other kinds of Periwinkles.

Features: 0.8-1cm. Shell is more rounded than other periwinkles commonly found in the same zone. Shell thin with fine grooves. Colour and pattern variable. Operculum thin, circular, made of a horn-like material.

Several species of periwinkles have round shells including Echinolittorina vidua and Echinolittorina melanacme.

Sentosa, Oct 03

East Coast Park, Jun 06

East Coast Park, Jun 06

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Round periwinkle snails on Singapore shores
On wildsingapore flickr

With grateful thanks to Tan Siong Kiat of the Raffles Museum of Biodiversity Research for identifying this snail.


  • 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.
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