Chthamalus fragilis Darwin, 1854
Chthamalus fragilis is a small barnacle (up to 9 mm in size). Its orifice is large, toothed, and sub-hexagonal. The surface is brownish-colored, with distinct sutures, and the plates never fused together. The side plates overlap over the end plates. The scutum is long with a somewhat sinuous tergal margin. The adductor muscle insertion is comparatively shallow, fairly narrow, and 'open' at the rostral end. The tergum is wide with a noticeable spur. The lateral margin is usually deeply indented, and the scutal margin is only slightly sinuous (Darwin 1854; Gosner 1978; Dando and Southward 1980).
Florida and Caribbean (Dando and Southward 1983)
Brazil (Dando and Southward 1983)
Florida and Caribbean, Brazil (Dando and Southward 1983)