Editing Chelicerata (section)

==Diversity==
Although well behind the insects, chelicerates are one of the most diverse groups of animals, with over 77,000 living species that have been described in scientific publications.<ref name="Shultz2001ArachnidsInEncOfLifeSci">{{citation
| contribution=Chelicerata (Arachnids, Including Spiders, Mites and Scorpions) | author=Shultz, J.W.
| s2cid=85601266
| title=Encyclopedia of Life Sciences | year=2001 | publisher= John Wiley & Sons, Ltd.
| doi=10.1038/npg.els.0001605
| isbn=978-0470016176
}}</ref> Some estimates suggest that there may be 130,000 undescribed species of spider and nearly 500,000 undescribed species of mites and ticks.<ref>{{citation
| title=Numbers of Living Species in Australia and the World | date=September 2005
| publisher=Department of the Environment and Heritage, Australian Government
| url=http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/2009/pubs/nlsaw-2nd-complete.pdf
| access-date=2010-03-29
}}</ref> While the earliest chelicerates and the living [[Pycnogonida]] (if they are chelicerates<ref name="PoschmannDunlop2006NewSeaSpider" />) and [[Xiphosura]] are marine animals that breathe dissolved [[oxygen]], the vast majority of living species are air-breathers,<ref name="Shultz2001ArachnidsInEncOfLifeSci" /> although a few spider species build "[[diving bell]]" webs that enable them to live under water.<ref>{{citation
 |author1=Schütz, D. 
 |author2=Taborsky, M. 
 |title=Adaptations to an aquatic life may be responsible for the reversed sexual size dimorphism in the water spider, ''Argyroneta aquatica'' 
 |journal=Evolutionary Ecology Research 
 |year=2003 
 |volume=5 
 |issue=1 
 |pages=105–117 
 |url=http://www.zoology.unibe.ch/behav/pdf_files/Schuetz_EvolEcolRes03.pdf 
 |access-date=2008-10-11 
 |url-status=dead 
 |archive-url=https://web.archive.org/web/20081216214632/http://www.zoology.unibe.ch/behav/pdf_files/Schuetz_EvolEcolRes03.pdf 
 |archive-date=2008-12-16 
}}</ref> Like their ancestors, most living chelicerates are carnivores, mainly on small [[invertebrate]]s. However, many species feed as [[parasite]]s, [[herbivore]]s, [[scavenger]]s and [[detritivore]]s.<ref name="RuppertFoxBarnes2004Acari" /><ref name="RuppertFoxBarnes2004Opiliones" /><ref name="Shultz2001ArachnidsInEncOfLifeSci" />
{| class="wikitable" style="text-align:center"
| align="center" colspan="3" | Diversity of living chelicerates
|-
! Group !! Described species<ref name="Shultz2001ArachnidsInEncOfLifeSci" /><ref>Pinto-da-Rocha, R., G. Machado, G. Giribet. 2007. Harvestmen: The Biology of Opiliones. Harvard University Press. Cambridge, MA.</ref><ref>{{Cite journal |last1=Gloor |first1=Daniel |last2=Nentwig |first2=Wolfgang |last3=Blick |first3=Theo |last4=Kropf |first4=Christian |date=2017 |title=World Spider Catalog |url=http://wsc.nmbe.ch/ |language=en |doi=10.24436/2}}</ref> !! Diet
|-
! [[Pycnogonida]] (sea-spiders)
| 500 <!-- use Shultz in ELS for num of species, as in other articles - hope ELS consistent-->|| Carnivorous<ref name="Shultz2001ArachnidsInEncOfLifeSci" />
|-
![[Araneae]] (spiders)
| 50,300 || Carnivorous;<ref name="Shultz2001ArachnidsInEncOfLifeSci" /> 1 [[Bagheera kiplingi|herbivore]]<ref name="MeehanOlsonCurry2008VegetarianJumpingSpider" />
|-
![[Acari]] (mites and ticks)
| 32,000 || Carnivorous, parasitic, herbivore, [[detritivore]]<ref name="RuppertFoxBarnes2004Acari" /><ref name="Shultz2001ArachnidsInEncOfLifeSci" />
|-
![[Opiliones]] (harvestmen)
| 6,500 || Carnivorous, herbivore, detritivore<ref name="RuppertFoxBarnes2004Opiliones" />
|-
![[Pseudoscorpiones]] (false scorpions)
| 3,200 || Carnivorous<ref>{{citation
| title=Pseudoscorpion - Penn State Entomology Department Fact Sheet | publisher=Pennsylvania State University
| url=http://www.ento.psu.edu/extension/factsheets/pseudoscorpion.htm | access-date=2008-10-26 }}</ref>
|-
![[Scorpiones]] (scorpions)
| 1,400 || Carnivorous<ref name="RuppertFoxBarnes2004Scorpions" />
|-
![[Solifugae]] (sunspiders)
| 900 || Carnivorous, [[omnivorous]]<ref name="RuppertFoxBarnes2004Solifugae">{{harvnb|Ruppert|Fox|Barnes|2004|pp=586–588}}</ref>
|-
![[Schizomida]] (small whipscorpions)
| 180 ||Carnivorous<ref name="Beccaloni">{{cite book |last=Beccaloni |first=Jan |date=2009 |title=Arachnids |location=Berkeley, CA |publisher=University of California Press |page=135|isbn=978-0-520-26140-2}}</ref>
|-
![[Amblypygi]] (whipspiders)
| 100 ||Carnivorous<ref name="Chapin">{{cite journal |last1=Chapin |first1=KJ |last2=Hebets |first2=EA |year=2016 |title=Behavioral ecology of amblypygids |url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1056&context=bioscihebets |journal=Journal of Arachnology |volume=44 |issue=1 |pages=1–14 |doi=10.1636/V15-62.1 |s2cid=29923727|url-access=subscription }}</ref>
|-
![[Uropygi]] (whipscorpions)
| 90 || Carnivorous<ref>{{citation
 |author = Harvey, M.S.
 |title = The Neglected Cousins: What do we Know about the Smaller Arachnid Orders?
 |journal = Journal of Arachnology
 |volume = 30
 |pages = 357–372
 |year = 2002
 |url = http://www.americanarachnology.org/JoA_Congress/JoA_v30_n2/arac-30-02-357.pdf
 |access-date = 2008-10-26
 |doi = 10.1636/0161-8202(2002)030[0357:TNCWDW]2.0.CO;2
 |issn = 0161-8202
 |issue = 2
 |s2cid = 59047074
 |archive-url = https://web.archive.org/web/20101213135221/http://www.americanarachnology.org/JoA_Congress/JoA_v30_n2/arac-30-02-357.pdf
 |archive-date = 2010-12-13
 |url-status = dead
}}</ref>
|-
![[Palpigradi]] (micro whipscorpions)
| 60 ||&nbsp;
|-
! [[Xiphosura]] (horseshoe crabs)
| 4 || Carnivorous<ref name="Shultz2001ArachnidsInEncOfLifeSci" />
|-
! [[Ricinulei]]
| 60 || Carnivorous<ref>{{cite journal |author=J. A. L. Cooke |year=1967 |title=Observations on the biology of Ricinulei (Arachnida) with descriptions of two new species of ''Cryptocellus'' |journal=[[Journal of Zoology]] |volume=151 |issue=1 |pages=31–42 |doi=10.1111/j.1469-7998.1967.tb02864.x}}</ref>
|}