soft body part shell peduncle 2019-10-05T09:19:10Z BTO:0006315 BrendaTissueOBO Marion Pedunculate, goose or goose-neck barnacles have a flexible, muscular stalk, known as the peduncle, which supports the main body known as the capitulum. In Pollicipes pollicipes the peduncle may reach over 10 cm in length and is strongly attached to the substratum despite repeated battering in exposed conditions. mussel peduncle