09 Callochiton septemvalvis

09 Callochiton septemvalvis

Head and tail valves darker than other valves. Fully spread girdle on each side is up to 40% the width of exposed valve v. Girdle has densely packed needles closely appressed to the surface; most easily discerned when of contrasting colour (magnified in inset). Cornwall, England. July 2023 © M. Vos.