36 Patella pellucida. Length 10.9mm. Growth Stage 5 holdfast dweller (GS5h). March 2017. West Anglesey, Wales.

The exterior surface of holdfast dwellers is less smooth than on frond and stipe dwellers and, on this one, is partly coated with epizoic animals . As usual, the juvenile growth is mainly free of epizoa.

This GS5 shell has acquired a thickening interior layer with a distinct pedal-retractor-muscle scar (1) and mantle-attachment scar (2) .

 

Concise Key id. features: 1Pp flic.kr/p/Z4FxDe

Part 1, SHELL FORMS: 2Pp flic.kr/p/Z4FxAi

Part 2, BODY & ANATOMY: 3Pp flic.kr/p/Z4FxtK

Part, 3 HABITS & ECOLOGY: 4Pp flic.kr/p/Z4Fx9M

Sets of OTHER SPECIES: www.flickr.com/photos/56388191@N08/collections/

Done