46 Patella pellucida. Growth stage 5 (possibly GS4). January 2014 (left) and March 2017. Sublittoral. Egersund, S. Norway. © E. Svensen.

Without measurements, it is difficult to tell what growth stage these are at, but the wide band of anterior adult growth (1) with continuous growth lines (2) suggests they are late GS4 or early GS5 that have not reached sufficient height to resemble a Phrygian cap. Unlike most British specimens, the strong blue lines continue right across the anterior adult growth.

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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