39 Patella pellucida. Growth Stage 5 holdfast dweller (GS5h). September 2014. North Yorkshire, England.

Epizoic growths rubbed off for photography.
Blue rays survive on the juvenile growth at the summit. They sometimes continue onto adult growth, but frequently, as on this, they are entirely replaced by red-brown rays (mostly covered by epizoic growths when live).
On the interior, the peripheral zone is brown, but the area within the pedal-retractor-muscle scar is grey, which somewhat resembles Patella vulgata.

Concise
Part 1, SHELL FORMS: 02 Patella pellucida. Growth Stage 2 (GS2). July 2012. Littoral. North Yorkshire, England. © P. Lightfoot.
Part 2, BODY & ANATOMY: 03 Patella pellucida. Growth Stage 3 (GS3). 2009. Sublittoral, Farne Islands, Northumberland, England. © P.Lightfoot.
Part, 3 HABITS & ECOLOGY: 04 Patella pellucida. Length 4.6mm. Growth Stage 3 (GS3). September 2016. Yorkshire, England. © P.Lightfoot.

Imprint

Photographic guide to the identification and biology of European marine invertebrates

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