Single large, diameter 8 mm, Chthamalus stellatus. Tergoscutal flaps: brown mark at rostral (lower) end (1), bright orange mark at micropyle (2) and orange lobe next to rim of flap at carinal (upper) end (3). Area of light blue flap next to white rim in rostral half (4). Surrounded by smaller C. montagui (5) Portland Bill, Dorset.