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Rocky Shore
barnacles
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Rock Barnacles!
 
animation of adult barnacle feeds
                                                
 
 
Diet- When submerged in water, the barnacle opens its "trapdoor" to extend its feathery feet, called cirri, into the water, trapping plankton to eat. The legs also have gills for breathing. 
 
Anatomy-  The Rock Barnacle is about 1 inch high, and 1/2 inch wide at its base. It has a flat, white top.  They also have 6 pairs of feathery legs which extend through the opening when feeding.  It has a few vertical grooves at the base.
 
Interesting Fact- Rock barnacles look like a tiny shrimp glued down by the top of its head, with its antennae waving in the current.