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Phylum Mollusca > Class Gastropoda > Family Littorinidae
Black-mouth mangrove periwinkle snail
Littoraria melanostoma
Family Littorinidae
updated Aug 2020

Where seen? This rather large periwinkle is sometimes seen on mangrove tree trunks and sometimes even leaves. Usually seen alone.

Features: 2-3cm. Shell conical with sharp tip, smooth, yellow with fine spiral pattern of brown dots. Sometimes the shell is bleached white. Shell opening with black edge. "Melanostoma" means "black mouth". Operculum thin, circular, dark brown, made of a horn-like material. The animal is yellowish with short fat tentacles.

Baby Black-mouths: According to Tan, it releases egg capsules into the sea every two weeks during the spring tides when the sea level rises to reach it.

Berlayar Creek, Jan 09

Black edge on the shell opening.
Berlayar Creek, Jan 09
Sungei Buloh Wetland Reserve, Mar 05

Black-mouth mangrove periwinkle snails on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores



  • 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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