Acorn barnacle

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Acorn barnacle and acorn shell are vernacular names for certain types of stalkless barnacles, generally excluding stalked or gooseneck barnacles. As adults they are typically cone-shaped, symmetrical, and attached to rocks or other fixed objects in the ocean. Members of the barnacle order Balanomorpha are often called acorn barnacles.[1][2]

File:Acorn Barnacles - Flickr - brewbooks.jpg
Acorn barnacles, Balanus glandula
File:Semibalanus balanoides 2257.jpg
Acorn barnacles, Semibalanus balanoides

In addition, several species of barnacles are specifically called by the common name "acorn barnacle", including:[3][4][5]

References

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