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 A small spiralling shell with six whorls. Up to 6 mm high but more typically around 4 mm. The shell is brown to yellow in colour. The body of the snail is a clear grey frequently with various pigment spots.Also known as the mud snail. Many synonyms have been used in the past but Peringia ulvae is the only one used recently. Hydrobia ulvae is now the standard usage although Peringia is often used as a sub-genus of Hydrobia. Hydrobia neglecta has a black 'v' mark near the tip of the tentacles.
 The taxonomy of the Gastropoda has been recently revised (see Ponder & Lindberg 1997, and Taylor 1996). Ponder & Lindberg (1997) suggest that Mesogastropoda should be included in a monophyletic clade, the Caenogastropoda.


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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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