Editing Barnacle (section)

=== Parasitism ===

[[File:Sacculina carcini.jpg|thumb|''[[Sacculina carcini]]'' (highlighted) parasitising the crab ''[[Liocarcinus holsatus]]''. ]]

Other members of the class have an entirely different mode of life. Barnacles of the [[superorder]] [[Rhizocephala]], including the [[genus]] ''[[Sacculina]]'', are [[parasitic castrator]]s of other arthropods, including crabs. The anatomy of these parasitic barnacles is greatly reduced compared to their free-living relatives. They have no carapace or limbs, having only unsegmented sac-like bodies. They feed by extending thread-like rhizomes of living cells into their hosts' bodies from their points of attachment.<ref name="Hosie 2018">{{cite web |url=http://www.marlin.ac.uk/species/detail/2233 |title=Crab hacker barnacle (''Sacculina carcini'') |last=Hosie |first=A. M. |year=2008 |publisher=[[MarLIN]] |access-date=14 January 2018 |url-status=live |archive-url=https://web.archive.org/web/20180115184524/http://www.marlin.ac.uk/species/detail/2233 |archive-date=15 January 2018 }}</ref>
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Goose barnacles of the genus ''[[Anelasma]]'' (in the order [[Pollicipedomorpha]]) are specialized parasites of certain shark species. Their cirri are no longer used to filter-feed. Instead, these barnacles get their nutrients directly from the host through a root-like body part embedded in the shark's flesh.<ref>{{cite journal |last=Rees |first=David John |date=16 June 2014 |title=On the Origin of a Novel Parasitic-Feeding Mode within Suspension-Feeding Barnacles |journal=Current Biology |volume=24 |issue=12 |pages=1429-1434 |doi=10.1016/j.cub.2014.05.030 |doi-access=free}}</ref>