23 Patella pellucida. Exceptional form of Growth Stage 5 frond dweller (GS5f). August 2015. Tyne and Wear, England. © P.Lightfoot. – Marinvert

23 Patella pellucida. Exceptional form of Growth Stage 5 frond dweller (GS5f). August 2015. Tyne and Wear, England. © P.Lightfoot.

Late adult, GS5f, on Laminaria frond. Very unusually for a frond dweller, instead of forming a high conoid, the adult growth is almost horizontal, like the flat brim of a hat. The growth somewhat resembles that of a stipe dweller so it might be one that has been displaced from a stipe, but the low profile gives it a better chance than a high conoid of surviving strong waves on the frond. This specimen was not from sheltered conditions where high conoids can survive.
It is also exceptional for Britain in having well developed bright blue lines continuing on the adult growth all around the shell like those found in Norway.

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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