Editing Chelicerae (section)

===Three-segmented chelate chelicerae===
<gallery mode="packed">
Limulus polyphemus 201780311 (cropped).jpg|Three-segmented chelicerae of an [[Atlantic horseshoe crab]]
Pantopsalis albipalpis 1276804.jpg| ''[[Pantopsalis albipalpis]]'', a species of harvestman with exceptionally long three-segmented chelicerae
Acutiramus cummingsi (YPM IP 018609).jpg|Isolated fossil chelicera of a [[pterygotid]] [[eurypterid]], ''[[Acutiramus|Acutiramus cummingsi]]''
</gallery>
Having three-segmented chelate chelicerae is the primitive condition and occurs in [[arachnid]]s such as the [[Scorpion]]es and the [[Opiliones]], as well as in non-arachnid Chelicerata such as the [[Xiphosura]] and [[Eurypterida]].<ref>{{cite journal |last1=Schmidt |first1=Michel |last2=Melzer |first2=Roland R. |title=The "elongate chelicera problem": A virtual approach in an extinct pterygotid sea scorpion from a 3D kinematic point of view |journal=Ecology and Evolution |date=May 2024 |volume=14 |issue=5 |pages=e11303 |doi=10.1002/ece3.11303 |pmid=38766312 |language=en |issn=2045-7758|pmc=11099745 }}</ref> The chelifores of the [[Pycnogonida]] may be homologous to chelicerae.<ref>{{cite journal |last1=Nakamura |first1=Koichiro |last2=Kano |first2=Yasunori |last3=Suzuki |first3=Nobuo |last4=Namatame |first4=Takashi |last5=Kosaku |first5=Akinori |title=18S rRNA phylogeny of sea spiders with emphasis on the position of Rhynchothoracidae |journal=Marine Biology |date=1 December 2007 |volume=153 |issue=2 |pages=213–223 |doi=10.1007/s00227-007-0803-0 |url=https://link.springer.com/article/10.1007/s00227-007-0803-0 |language=en |issn=1432-1793|url-access=subscription }}</ref>