FSC (Field Studies Council) - The Sea Shore.
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The Purple Topshell (Gibbula umbilicalis) is a species of gastropod. This species is found on coasts which border the Atlantic and English Channel, and inhabits middle and lower shore. This species can reach 17mm high, but is wider than it is high. There are about 7 whorls. Gallery Underside of Purple Topshell Add a photo to this gallery Purple Topshell.
An Introduction to the Common Topshell 117 FIG.3. Shells of the four species of topshell most commonly found on British rocky shores. (a) A purple topshell, Gibbula umbilicalis (da Costa 1778).(b) The grey topshell or silver tommy.
Until around 2000, the marine gastropod Gibbula umbilicalis (Da Costa 1778) was previously only present as far east as the Isle of Wight on the south coast of England. Since 2000 the range of Gibbula umbilicalis has extended 140km eastwards with records now present as far along the coast as Kent. Since the 1990s temperatures in the English Channel have increased faster (and to higher levels.
Shallow rockpools throughout the eulittoral zone on exposed to moderately exposed shores dominated by the brown seaweed Sargassum muticum and the red seaweed Corallina officinalis. Other brown seaweeds, including the kelp Laminaria saccharina, Laminaria digitata and the wrack Fucus serratus may occur along with Dictyota dichotoma, but S. muticum always dominates.
Shell colour similar to Gibbula umbilicalis, but with reticulate rather than striped pattern on base of last whorl; some shells homogeneous coppery red, green, or black, with or without red or white spiral bands at periphery. Animal: Like Gibbula umbilicalis. Colour, however, is greyish rather than yellow.
Classification unranked Biota kingdom Animalia phylum Mollusca class Gastropoda family Trochidae genus Gibbula subgenus Gibbula (Steromphala) J E Gray, 1847 species Gibbula ardens (Salis Marschlins, 1793) species Gibbula candei (d'Orbigny, 1840) species Gibbula fanulum (Gmelin, 1791).