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Kingdom:<\/strong> Animalia<\/p>\n<\/li>\n
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Phylum:<\/strong> Arthropoda<\/p>\n<\/li>\n
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Subphylum:<\/strong> Crustacea<\/p>\n<\/li>\n
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Class:<\/strong> Thecostraca<\/p>\n<\/li>\n
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Subclass:<\/strong> Cirripedia<\/p>\n<\/li>\n
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Genus \/ Species:<\/strong> Hundreds\u2014including Balanus amphitrite<\/em>, Megabalanus rosa<\/em><\/p>\n<\/li>\n<\/ul>\n
Taxonomy chart showing barnacle classification within crustaceans (Source:\u00a0 ResearchGate)<\/em><\/p>\n
\u00a0Physical Characteristics<\/h4>\n
Barnacles range from 5 mm to over 5 cm. They feature:<\/p>\n
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Hard calcareous plates surrounding a small central body<\/p>\n<\/li>\n
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Feather\u2011like cirri (feathery legs) that sweep plankton into their mouth<\/p>\n<\/li>\n
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A stalked (goose barnacle) or sessile (acorn barnacle) form<\/p>\n<\/li>\n
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Colors: mostly white, gray, or muted tones; some tropical species bear pink or orange hues<\/p>\n<\/li>\n<\/ul>\n
<\/div>\n<\/em><\/p>\n
Barnacle anatomical diagram with labeled plates and feeding cirri(Source: Marine Education Society Of Autralasia)<\/em><\/p>\n
\u00a0Habitat and distribution<\/h4>\n
Barnacles are found on:<\/p>\n
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Rocky shores, piers, ship hulls, and mollusk shells<\/p>\n<\/li>\n
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From intertidal zones to depths exceeding 200\u202fm<\/p>\n<\/li>\n
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Throughout all oceans and seas worldwide<\/p>\n<\/li>\n<\/ul>\n
Global coastal map showing common barnacle zones (Source: ReserchGate)<\/em><\/p>\n
\u00a0Diet and feeding habits<\/h5>\n
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Barnacles are filter feeders that feed on plankton and organic particles<\/p>\n<\/li>\n
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Inside their shell, they rhythmically extend and retract cirri to capture food<\/p>\n<\/li>\n
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Feeding is suspended during low tide when closed tight<\/p>\n<\/li>\n<\/ul>\n
Barnacle extending cirri into currents to feed (Source: Science Photo Library)<\/em><\/p>\n
\u00a0Life cycle and reproduction<\/h4>\n
Barnacles undergo complex development:<\/p>\n
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Egg \u2192 nauplius larva<\/strong> (planktonic, free-swimming)<\/p>\n<\/li>\n
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Cypris larval stage<\/strong> (finds and settles onto substrate)<\/p>\n<\/li>\n
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Metamorphosis: <\/strong>secretes shell and attaches permanently<\/p>\n<\/li>\n
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Adult: <\/strong>male or hermaphrodite; fertilization often occurs via long penises across neighbors<\/p>\n<\/li>\n<\/ol>\n
![\"Barnacle](\"https:\/\/www.coastmountainexpeditions.com\/wp-content\/uploads\/2020\/11\/Barnacle-life-cycle.gif\")
Life cycle chart showing larval and settlement stages (Source: Coast Mountain Expeditions)<\/em><\/p>\n\u00a0Behavior and adaptations<\/h4>\n
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Extreme adhesion<\/strong>: Barnacles secrete glue stronger than many adhesives<\/p>\n<\/li>\n
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Tide tolerance<\/strong>: Close their shell plates to avoid drying out<\/p>\n<\/li>\n
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Hermaphroditism<\/strong>: Many can self-fertilize or cross-fertilize neighbors<\/p>\n<\/li>\n
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Vertical growth<\/strong>: Some build upward into columns to outcompete space<\/p>\n<\/li>\n<\/ul>\n
![\"2+](\"https:\/\/www.shutterstock.com\/image-photo\/growths-on-bottom-boat-cleaning-600nw-554658070.jpg\")
Dense barnacle colony attached to boat hull (Source: Shutterstock)<\/em>\u00a0<\/em><\/div>\n\u00a0Ecological importance<\/h4>\n
Barnacles contribute to marine ecosystems by:<\/p>\n
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Creating habitat<\/strong>: Their shells provide homes for small crustaceans, algae, and fish<\/p>\n<\/li>\n
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Acting as filters<\/strong>: Cleaning plankton and particulate matter from water<\/p>\n<\/li>\n
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Serving as prey<\/strong>: Snails, whelks, and starfish feed on barnacles<\/p>\n<\/li>\n<\/ul>\n
\u00a0Notable barnacle species<\/h4>\n
\n\n\n\n
\n \nSpecies<\/th>\n Region<\/th>\n Size<\/th>\n Key Traits<\/th>\n<\/tr>\n<\/thead>\n \n Balanus amphitrite<\/em><\/td>\n Tropical\/subtrop.<\/td>\n ~10\u202fmm<\/td>\n Common tropical acorn barnacle<\/td>\n<\/tr>\n \n Megabalanus rosa<\/em><\/td>\n Pacific coast<\/td>\n 3\u20135\u202fcm<\/td>\n Pink, large and commercially collected<\/td>\n<\/tr>\n \n Lepas anatifera<\/em><\/td>\n Global oceans<\/td>\n ~2\u202fcm long stalk<\/td>\n Goose barnacle drifted on flotsam<\/td>\n<\/tr>\n \n Chthamalus stellatus<\/em><\/td>\n Atlantic intertidal<\/td>\n ~5\u202fmm<\/td>\n Tolerates strong wave action<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n![\"The](\"https:\/\/www.researchgate.net\/publication\/233508024\/figure\/fig2\/AS:462669460316160@1487320403853\/The-six-species-of-goose-barnacles-associated-with-floating-substrata-in-South-Africa-A.png\")
Images displaying various barnacle species (Source: ResearchGate)<\/em><\/p>\n\u00a0Threats and conservation status<\/h4>\n
While common, barnacles face:<\/p>\n
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Habitat loss due to coastal development<\/p>\n<\/li>\n
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Pollution and acidification affecting larval survival<\/p>\n<\/li>\n
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Marine coatings and hull cleaning lowering their habitats<\/p>\n<\/li>\n<\/ul>\n
Barnacles are not endangered, but they are indicators of clean, productive waters.<\/p>\n
\u00a0Interaction with humans<\/h4>\n
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Pest on boats<\/strong>: Biofouling increases drag and fuel use<\/p>\n<\/li>\n
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Commercial harvest<\/strong>: Some cultures cook goose barnacles as delicacy<\/p>\n<\/li>\n
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Research use<\/strong>: Their adhesive proteins inspire bio\u2011adhesive development<\/p>\n<\/li>\n
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Handling caution<\/strong>: Hard shells may cause cuts; allergies are rare<\/p>\n<\/li>\n<\/ul>\n
<\/em><\/p>\n
Person harvesting goose barnacles from driftwood (Source: Facebook)<\/em><\/p>\n
\u00a0Fun facts<\/h4>\n
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Fact:<\/strong> Barnacle glue is one of the strongest glues known, insoluble in saltwater and durable over decades.<\/p>\n<\/li>\n
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Fact:<\/strong> They can raise their shell plates only when submerged\u2014to feed\u2014then snap shut in 0.1 seconds.<\/p>\n<\/li>\n
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Fact:<\/strong> In the 19th century, Darwin studied barnacles for 8 years, great prep for his evolution theory.<\/p>\n<\/li>\n<\/ul>\n
![\"750+](\"https:\/\/media.istockphoto.com\/id\/1334880395\/photo\/barnacles.jpg?s=612x612&w=0&k=20&c=Rk3iAbkgDng_JU1e-YxaiuBk-Vjy_Y7nSH5bxjqwApU=\")
<\/em><\/p>\nBarnacles tightly packed on pier pilings under ocean light (Source: iStock)<\/em><\/p>\n
If you enjoyed learning about barnacles, please share this post with others. <\/strong>For more marine animal description or animal health care, do not hesitate to reach out to us at Doctor Hulk Veterinary Hospital<\/strong> through 08143397614<\/strong>, or explore the full Anipedia<\/strong> library.<\/p>\n","protected":false},"excerpt":{"rendered":"
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