Editing Fluorescence (section)

==== Arachnids ====
[[File:Sorpion Under Blacklight edit.jpg|thumb|Fluorescing scorpion]]
Spiders fluoresce under UV light and possess a huge diversity of fluorophores. Andrews, Reed, & Masta noted that spiders are the only known group in which fluorescence is "taxonomically widespread, variably expressed, evolutionarily labile, and probably under selection and potentially of ecological importance for intraspecific and interspecific signaling".<ref name=Andrews-Reed-Masta-2007/> They showed that fluorescence evolved multiple times across spider taxa, with novel fluorophores evolving during spider diversification.

In some spiders, ultraviolet cues are important for predator–prey interactions, intraspecific communication, and camouflage-matching with fluorescent flowers. Differing ecological contexts could favor inhibition or enhancement of fluorescence expression, depending upon whether fluorescence helps spiders be cryptic or makes them more conspicuous to predators. Therefore, natural selection could be acting on expression of fluorescence across spider species.<ref name=Andrews-Reed-Masta-2007>
{{cite journal
 | last1 = Andrews | first1 = K.
 | last2 = Reed    | first2 = S.M.
 | last3 = Masta   | first3 = S.E.
 | year = 2007
 | title = Spiders fluoresce variably across many taxa
 | journal = Biology Letters
 | volume = 3  | issue = 3  | pages = 265–267
 | doi = 10.1098/rsbl.2007.0016
 | pmid = 17412670  | pmc = 2104643
}}</ref>

Scorpions are also fluorescent, in their case due to the presence of [[beta-carboline]] in their cuticles.<ref name=Stachel-Stockwell-vanVranken-1999>
{{cite journal
 | last1 = Stachel     | first1 = S.J.
 | last2 = Stockwell   | first2 = S.A.
 | last3 = van Vranken | first3 = D.L.
 | year = 1999
 | title = The fluorescence of scorpions and cataractogenesis
 | journal = Chemistry & Biology
 | volume = 6  | issue = 8  | pages = 531–539
 | doi = 10.1016/S1074-5521(99)80085-4
 | doi-access = free   | pmid=10421760
}}
</ref>