18 Patella depressa. Length 30mm. Pallial gills. Lleyn, Wales. September 2015.

18 Patella depressa. Length 30mm. Pallial gills. Lleyn, Wales. September 2015.

Pallial gills around complete perimeter of foot and head replace ctenidium found on most marine molluscs. Each gill is tongue-shaped leaflet attached by stalk to distal wall of pallial-groove. Groove in stalk and thickened rim contain cilia that remove debris particles.

OTHER SPECIES ALBUMS
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