Biodiversity & Conservation

Flat top shell - Gibbula umbilicalis

Gibbula umbilicalis

Image Keith Hiscock - Gibbula umbilicalis, flat top shell. Image width ca 4 cm.
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Distribution map

Gibbula umbilicalis recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)

Why do the maps differ?

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Gibbula umbilicalis is not listed under any importance categories.

Taxonomy icon Taxonomy Taxon English term
Phylum Mollusca Snails, slugs, mussels, cockles, clams & squid
Class Gastropoda Snails, slugs & sea butterflies
Authority da Costa, 1778
Recent synonyms None
Map icon Recorded Distribution in Britain and Ireland Gibbula umbilicalis is found on western shores of the UK as far north as Scotland and on suitable shores in Ireland. It is absent from the North Sea coast and eastern English Channel.
Habitat information icon Habitat information Found from the upper shore into the sublittoral on sheltered rocky shores and is tolerant of emersion and brackish waters.
Text page icon Description A small top shell, it is slightly broader, more rounded and flatter than Gibbula cineraria, it also has a large round umbilicus (a deep hole on the underside of the shell). It is dull greenish-grey in colour and has broad diagonal stripes of reddish-purple.
Identifying features
  • Small topshell 1.6 cm high, 2.2 cm across.
  • Large round umbilicus.
  • Dull greenish grey in colour with reddish-purple broad diagonal stripes.
Additional information icon Additional information A form without the umbilicus has been recorded in south-east Cornwall and south-west Devon.

This review can be cited as follows:

Paolo Pizzolla 2008. Gibbula umbilicalis. Flat top shell. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/11/2015]. Available from: <>