BIOL 321 Lecture Notes - Lecture 28: Goose Barnacle, Filter Feeder, Commensalism
17 Nov 2016
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Lifestyle: sessile lifestyle (unusual!, carapace as calcified plates, free-living and symbiotic forms (commensals & parasites) Body plan: acorn & stalked: acorn barnacles- ones the ones you usually see. Have a calcified cone that is directly attached to the substrate: stalked barnacles (=gooseneck)- calcified plates are mounted on a fleshy stalk to attach to the substrate. Confined to places where there is high water flow or water flow. They are incapable of sweeping their cirri through the water. The stalk is called the peduncle: exoskeleton: heavily calcified plates. There is a series of 4 plates hat fit into the aperture and these are opercular plates and there is muscles that open them to allow the parts to come out. There are 6 pairs of thoracic appendages (cirri) that come out when the opercular plates are opened: molting: barnacles only molt the exoskeleton of the cirri and a portion of the main body.
