Editing Porcelain crab (section)

==Evolution==
Porcelain crabs are an example of [[carcinisation]], whereby a noncrab-like animal (in this case a relative of a squat lobster) evolves into an animal that resembles a [[crab|true crab]].<ref>{{cite journal |author1=C. L. Morrison |author2=A. W. Harvey |author3=S. Lavery |author4=K. Tieu |author5=Y. Huang |author6=C. W. Cunningham |year=2001 |title=Mitochondrial gene rearrangements confirm the parallel evolution of the crab-like form |journal=[[Proceedings of the Royal Society B]] |volume=269 |pages=345–350 |url=http://www.biology.duke.edu/cunningham/pdfs/Morrison%20et%20al.pdf |doi=10.1098/rspb.2001.1886 |issue=1489 |pmid=11886621 |pmc=1690904}}</ref><ref>{{cite journal |author1=Jonas Keiler, Stefan Richter  |author2=Christian S. Wirkner  |name-list-style=amp |year=2014 |title=Evolutionary morphology of the organ systems in squat lobsters and porcelain crabs (crustacea: Decapoda: Anomala): an insight into carcinization |journal=[[Journal of Morphology]] |doi=10.1002/jmor.20311 |pmid=25156549 |volume=276 |issue=1 |pages=1–21|s2cid=26260996 }}</ref> Porcelain crabs can be distinguished from true crabs by the apparent number of [[pereiopod|walking legs]] (three instead of four pairs; the fourth pair is reduced and held against the [[carapace]]), and the long [[antenna (biology)|antennae]] originating on the front outside of the [[eyestalk]]s.<ref name="Poore">{{cite book |author1=Gary C. B. Poore  |author2=Shane T. Ahyong  |name-list-style=amp |year=2004 |title=Marine decapod Crustacea of southern Australia: a guide to identification |publisher=[[CSIRO Publishing]] |isbn=978-0-643-06906-0 |chapter=Porcellanidae Haworth, 1825 |pages=242–246 |chapter-url=https://books.google.com/books?id=ZZWnuGc0xlMC&pg=PA242}}</ref> The [[abdomen]] of the porcelain crab is long and folded underneath it, free to move.<ref name="Poore"/>