Editing Barnacle (section)

=== Cypris larva ===

The cypris larva is the second and final larval stage before adulthood. In Rhizocephala and Thoracica an abdomen is absent in this stage, but the y-cyprids (post-naupliar instar) has three distinct abdominal segments.<ref>{{cite journal |last1=Hoeg |first1=Jens |last2=Pérez-Losada |first2=Marcos |last3=Glenner |first3=Henrik |last4=Kolbasov |first4=Gregory |last5=Crandall |first5=Keith |title=Evolution of Morphology, Ontogeny and Life Cycles within the Crustacea Thecostraca |journal=Arthropod Systematics & Phylogeny |date=25 August 2009 |volume=67 |issue=2 |pages=199–217 |doi=10.3897/asp.67.e31697 |doi-access=free}}</ref> It is not a feeding stage; its role is to find a suitable place to settle, since the adults are [[Sessility (zoology)|sessile]].<ref name="Newman"/> The cyprid stage lasts from days to weeks. It explores potential surfaces with modified [[Antenna (biology)#Crustaceans|antennules]]; once it has found a suitable spot, it attaches head-first using its antennules and a secreted [[Glycoprotein|glycoproteinous]] cement. Larvae assess surfaces based upon their surface texture, chemistry, relative wettability, color, and the presence or absence and composition of a surface [[biofilm]]; swarming species are more likely to attach near other barnacles.<ref name="Anderson">{{cite book |last=Anderson |first=Donald Thomas |year=1994 |title=Barnacles: Structure, Function, Development and Evolution |publisher=[[Springer Science+Business Media|Springer]] |isbn=978-0-412-44420-3 |chapter=Larval development and metamorphosis |pages=197–246 |chapter-url=https://books.google.com/books?id=2MDH9IRDkdkC&pg=PA219}}</ref> As the larva exhausts its energy reserves, it becomes less selective in the sites it selects. It cements itself permanently to the substrate with another proteinaceous compound, and then undergoes [[Metamorphosis (biology)|metamorphosis]] into a juvenile barnacle.<ref name="Anderson"/>

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Balanus improvisus, cypris (rotated).jpg|Cypris larva of ''[[Amphibalanus improvisus]]''
File:Barnacles Cypris anatomy diagram vecorized.svg|Anatomy of cypris larva
</gallery>