12 Patella pellucida. Juveniles, Growth Stage 3 (GS3). Littoral. Largest, length 6.7mm, from Llŷn, N. Wales, April 1969. Others, shortest length 3.2mm, from Aberdeen, Scotland, 1971.

12 Patella pellucida. Juveniles, Growth Stage 3 (GS3). Littoral. Largest, length 6.7mm, from Llŷn, N. Wales, April 1969. Others, shortest length 3.2mm, from Aberdeen, Scotland, 1971.

Exteriors of juvenile shells. Iridescent blue hyphens increase from two or three rows at the start of GS3 and increase to about eight at its end when about 7mm long.

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.