13 Patella pellucida. Length 6.7mm. Juvenile, Growth Stage 3 (GS3). April 1969. Llŷn, N. Wales.

Left: shell exterior.
Right: shell interior.
The same shell is shown on pale and black backgrounds.
The blue rays appear more intense against the black background. The interior of the almost transparent shell has black, non-crystalline, colloidal particles under parts of the blue rays. In life, the particles, more visible against the pale background, have the same intensifying effect on the blue as the black background.

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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