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01 Patella pellucida. Shell of veliger larva, Growth Stage 1 (GS1). Drawing based on Lebour (1937).
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02 Patella pellucida. Growth Stage 2 (GS2). July 2012. Littoral. North Yorkshire, England. © P. Lightfoot.
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03 Patella pellucida. Growth Stage 3 (GS3). 2009. Sublittoral, Farne Islands, Northumberland, England. © P.Lightfoot.
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04 Patella pellucida. Length 4.6mm. Growth Stage 3 (GS3). September 2016. Yorkshire, England. © P.Lightfoot.
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05 Patella pellucida. Growth Stage 3 (GS3). Left: March 2017. W. Anglesey, Wales. Right: at smaller scale, September 2017. Tyne & Wear, England.
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06 Patella pellucida. Length 4.7mm. Growth Stage 3h (GS3h). Littoral. March 2017. West Anglesey, Wales.
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07 Patella pellucida. Growth Stage 3 (GS3). Littoral. Aberdeen, Scotland, 1971, except 5 from Llŷn, N. Wales, April 1969.
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08 Patella pellucida. Juveniles, Growth Stage 3 (GS3). Littoral. Length 6.7mm, Llŷn, N. Wales, April 1969. Length 3.2mm. Aberdeen, Scotland, 1971.
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09 Patella pellucida. Growth Stage 3 holdfast dweller (GS3h) on Laminaria. March 2017. Littoral. West Anglesey, Wales.
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11 Patella pellucida. 4,6mm long. Juvenile, Growth Stage 3 (GS3). From exterior of Laminaria holdfast. March 2017. Littoral. West Anglesey, Wales.
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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.
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13 Patella pellucida. Length 6.7mm. Juvenile, Growth Stage 3 (GS3). April 1969. Llŷn, N. Wales.
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14 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.
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15 Patella pellucida. Length 10.2mm. Early adult, Growth Stage 4 frond dweller (GS4f), on Laminaria. March 2014. Littoral. West Anglesey, Wales.
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16 Patella pellucida. Length 10.4mm. Growth Stage 4 frond dweller (GS4f), on Laminaria. March 2014. Littoral. West Anglesey, Wales.
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17 Patella pellucida. Length 10.2mm. Early adult, Growth Stage 4 frond dweller (GS4f), on Laminaria. March 2014. Littoral. West Anglesey, Wales.
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18 Patella pellucida. Length 10.2mm. Early adult, Growth Stage 4 frond dweller (GS4f), on Laminaria frond. March 2014. Littoral. West Anglesey, Wales.
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19 Patella pellucida. Length 10.2mm. Early adult, Growth Stage 4 frond dweller (GS4f). March 2014. Littoral. West Anglesey, Wales.
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20 Patella pellucida. Length about 15mm. Growth Stage 5 frond dweller (GS5f). March 2010. Menai Strait, Wales. © D. Evans.
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21 Patella pellucida. Length L19.3mm, H7.7mm. Growth Stage 5 frond dweller (GS5f). March 2014. Menai Strait, Wales.
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22 Patella pellucida. Length 14mm, Growth Stage 5 frond dweller (GS5f). February 2011. Menai Strait, Wales.
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23 Patella pellucida. Exceptional form of Growth Stage 5 frond dweller (GS5f). August 2015. Tyne and Wear, England. © P.Lightfoot.
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24 Patella pellucida. Length 11mm, Growth Stage 5 stipe dweller (GS5s). March 2011. Menai Strait, Wales.
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26 Patella pellucida. Length 11mm. Growth Stage 5 stipe dweller (GS5s). March 2011. Menai Strait, Wales.
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27 Patella pellucida. Growth Stage 4 stipe dweller (GS4s). July 2017. Tyne & Wear, England. © P.Lightfoot.
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28 Patella pellucida. Length 8.3mm. Growth Stage 4 holdfast dweller (GS4h). March 2017. West Anglesey, Wales.
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29 Patella pellucida. Length 8.3mm. Growth Stage 4 holdfast dweller (GS4h). March 2017. West Anglesey, Wales.
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29.1 Patella pellucida, growth stage 5h. Length 23.5mm. Embleton, Northumberland, England. March 2018. © P. Lightfoot.
