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| shelled snails text index | photo index |
| Phylum Mollusca > Class Gastropoda > Family Littorinidae |
| Knobbly
periwinkle snail Echinolittorina malaccana Family Littorinidae updated Feb 11 Where seen? This tiny snail with a knobbly shell is sometimes seen on some of our rocky shores. In small groups on boulders near the high water mark, often wedged into crevices and cracks at low tide. It was previously known as Nodilittorina trochoides and Nodilittorina pyramidalis. Features: 0.8-1cm. Shell thin with tiny with knobs in a spiral pattern. Colours variable, often bleached white. Able to withstand high temperatures, they are even hardier than the other periwinkles. It is believed that the knobbly texture of the shell helps to keep the snails cool. They often found so high up on the rocks that they are only wet for a few hours for the few days of high spring tides every two weeks or so. These tough snails feed only during these high spring tides or perhaps when it rains. |
 Chek Jawa, May 05 |
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 Underside. Chek Jawa, May 05 |
 Living snail. |
Knobbly periwinkle snails on Singapore shores
 St. John's Island, Feb 11  |
 Sentosa, May 08  |
 Sentosa, Nov 10 |
 Labrador, Jul 05 |
 St. John's Island, May 05 |
 Raffles Lighthouse, May 04 |
 East Coast, Aug 09 |
 Pulau Semakau, Jan 10 |
 Pulau Semakau, Feb 09 |
 Lazarus Island, Dec 06 |
 Lazarus Island, Jul 04 |
 Lazarus Island, Jul 11 |
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