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Phylum Mollusca > Class Gastropoda > Family Calyptraeidae
Flat slipper snail
Siphopatella walshi
Family Calyptraeidae
updated Oct 2016
Where seen? This snail is commonly encountered inside a shell occupied by a hermit crab. It is also sometimes found on the underside of horseshoe crabs. It was previously known as Crepidula walshi.

Features: 1-3.5cm. Shell thin, conical or flat, usually white. It is usually found in pairs. The larger one is usually the female and the smaller one male. When the smaller one grows big enough, it will change into a female!

Sometimes confused with limpets which are also gastropods but which can move about. Here's more on how to tell apart limpets, slipper snails and similar animals.

Chek Jawa, Mar 05

Changi, Apr 05

Changi, Jul 04

Sisters Island, Jan 11

Flat slipper snails on Singapore shores

Photos of Flat slipper snails for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


  • 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, K. S. & L. M. Chou, 2000. A Guide to the Common Seashells of Singapore. Singapore Science Centre. 160 pp.
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