12 Chthamalus montagui COMPARISON image of C. stellatus.

12 Chthamalus montagui COMPARISON image of C. stellatus.

Profile a low mound. Oval aperture. Sutures visible; rostral plate (1) narrow, butts onto (rostro-) lateral plates (2).
3: lateral plate. 4: carinal plate.
Lleyn Peninsula, Wales. October 2009.