Balanus aquila

Taxobox | name = "Balanus aquila"
status = DD | status_system = IUCN2.3
status_ref = [cite web |author=World Conservation Monitoring Centre |year=1996 |url=http://www.iucnredlist.org/search/details.php/2534/all |title="Balanus aquila" |accessdate=2007-08-09 |work=IUCN Red List of Threatened Species]
regnum = Animalia
phylum = Arthropoda
subphylum = Crustacea
classis = Maxillopoda
infraclassis = Cirripedia
ordo = Sessilia
familia = Balanidae
genus = "Balanus"
species = "B. aquila"
binomial = "Balanus aquila"
binomial_authority = Pilsbry, 1907 [ITIS|ID=89647|taxon="Balanus aquila"]

"Balanus aquila" is a species of acorn barnacle in the family Balanidae. It is found off the California coast from San Francisco to San Diego from the bottom of the intertidal zone down to depths of 18 m [cite book |url=http://pubs.usgs.gov/of/1998/of98-594/of98-594_2a.pdf |title=The Purisima Formation and related rocks (Upper Miocene – Pliocene), Greater San Francisco Bay Area, Central California: review of literature and USGS collection (now housed at the Museum of Paleontology, University of California, Berkeley) |author=Charles L. Powell, II |publisher=United States Geological Survey |year=1998] . It is preyed upon by fish, starfish and certain carnivorous snails. Fish also rub against the barnacles to clean themselves of parasites,which wears the barnacles shells to a smooth surface [cite web |title="Balanus aquila" Pilsbry, 1907—acorn barnacle |publisher=State of California, Department of Fish and Game |url=http://content.cdlib.org/xtf/view?docId=kt2x0n9933&doc.view=frames&chunk.id=d0e3116&toc.depth=1&toc.id=d0e3003&brand=calisphere |author=Charles H. Turner, Earl E. Ebert & Robert R. Given |year=1969 |work=Fish Bulletin 146: Man-Made Reef Ecology] .

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