acorn barnacle

Noun
  1. Barnacle that attaches to rocks especially in intertidal zones (synset 102001395)
    is a type of: barnacle, cirriped, cirripede - marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces
    belongs to: balanus, genus balanus - type genus of the family Balanidae
    same as: balanus balanoides, rock barnacle

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