44 Patella pellucida. Early adults, Growth stage 4 (GS4), on Laminaria hyperborea frond. February 2013 (left) and July 2015. Sublittoral. Egersund, S. Norway. © E. Svensen.

Early adults (GS4), as in Britain, cease anterior shell-loss and commence thicker growth (1) with continuous growth lines all around the perimeter (2), and the anterior rises to form a dome (3). In Norway, on frond dwellers, there are usually blue lines on the new adult growth at both anterior and posterior, but the right hand specimen is an exception as it lacks blue lines on anterior new growth in common with most British specimens and GS4 Norwegian ones on stipes.

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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