11 Cerithiopsis tubercularis

11 Cerithiopsis tubercularis

Opaque white anterior pedal gland (1) within bilaminate anterior produces mucus to aid crawling. Central pedal gland (2) with deep medial groove (3) where mucus from gland is formed into a line for fixing and climbing. Operculum (4). Tubercles paler than spaces between them (5). Shell height 3.8 mm. Menai Strait, Wales, March 2012.