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Cephalopods can use chromatophores like a muscle, which is why they can change their skin hue as rapidly as they do.
Coloration is typically stronger in near-shore species than those living in the open ocean, whose functions tend to be restricted to [[Camouflage#Disruptive patterning|disruptive camouflage]].<ref name=Cephalopods/>{{Rp|2}} These chromatophores are found throughout the body of the octopus, however, they are controlled by the same part of the brain that controls elongation during jet propulsion to reduce drag. As such,
Evidence of original coloration has been detected in cephalopod fossils dating as far back as the [[Silurian]]; these orthoconic individuals bore concentric stripes, which are thought to have served as camouflage.<ref>{{cite journal |title=Minute Silurian oncocerid nautiloids with unusual color patterns |last1=Manda |first1=Štěpán |last2=Turek |first2=Vojtěch |s2cid=54043278 | journal=Acta Palaeontologica Polonica | volume=54 | issue=3 |year=2009 |pages=503–512 | doi=10.4202/app.2008.0062|doi-access=free }}</ref> Devonian cephalopods bear more complex color patterns, of unknown function.<ref>{{cite journal|title=Colour patterns in Early Devonian cephalopods from the Barrandian Area: Taphonomy and taxonomy | first=Vojtěch |last=Turek | s2cid=55851070 |volume=54 | issue=3 |year=2009 |pages=491–502 |doi=10.4202/app.2007.0064 |journal=Acta Palaeontologica Polonica|doi-access=free }}</ref>
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