81 Patella pellucida. Shell length 9.2mm. Growth Stage 4 holdfast dweller (GS4h). March 2017. West Anglesey, Wales. – Marinvert

81 Patella pellucida. Shell length 9.2mm. Growth Stage 4 holdfast dweller (GS4h). March 2017. West Anglesey, Wales.

A black mark within the odontophore is visible through the epithelium of the head (1) and the overlying mantle (2).
The yellow digestive gland (3), composed of a mass of tubules, is usually the most obvious organ on the surface of the visceral mass.
Food material passes along the long coiled intestine(4) which is usually white like the consumed white inner parts of Laminaria. Faecal boluses (5) pass through the rectum (6) and are compressed and bound with mucus to emerge as faecal rods from the anus at the rear right of the nuchal cavity.
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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