CIRRIPEDE (GOOSE BARNACLE) TERMINOLOGY
Cirripedes are highly modified crustaceans. The adult stage attaches to a hard substrate by means of an elongate stalk (peduncle) (the head-end), whilst the main body is protected within an array of calcareous valves (the capitulum). Modern rocky-shore barnacles lack a peduncle. Modified appendages are extended through an aperture in the capitulum and move rapidly to generate water currents and draw in food particles.
1). (A) Modern goose barnacle with a well developed capitulum possessing robust valves. The fleshy peduncle was naked in life and has withered somewhat after death (x2). Plaster cast of a fossil form (Stramentum pulchellum, x3.1). This form has a relatively small capitulum, but a large and heavily armoured peduncle.
* Barnacle Biology
* Barnacle images
* Barnacles with appendages extended