49 Patella depressa album. Image of high-domed P. vulgata for comparison. Length 55mm, height 40mm. Menai Strait. March 2010.

49 Patella depressa album. Image of high-domed P. vulgata for comparison. Length 55mm, height 40mm. Menai Strait. March 2010.

High-domed form of large P. vulgata associated with high shore zone on well drained rock. Long periods with muscles contracted to obtain firm grip on substrate against water loss result in high shell. This size and profile height (73%) not attained by P. depressa, but some intermediate forms show a tendency towards high profile.

OTHER SPECIES ALBUMS
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