<sod>When first described, ''R. cratoensis'' was known from a pair of fossil adults,  the [[holotype]] number "HUANG-BP-B-4220" and [[paratype]] number "HUANG-NIGP163028". At the time of the insects description, the two specimens were residing in the [[Chinese Academy of Sciences|Chinese Academy of Sciences's Nanjing Institute of Geology and Paleontology]], in [[Nanjing]].  Both the winged adults are preserved as [[Inclusion (mineral)|inclusions]] in transparent chunks of yellow [[Burmese amber]] shaped and polished before study.<ref name="Myskowiak2016">{{Cite journal |last1=Myskowiak |first1=J. |last2=Huang |first2=D. |last3=Azar |first3=D. |last4=Cai |first4=C. |last5=Garrouste |first5=R. |last6=Nel |first6=A. |year=2016 |title=New lacewings (Insecta, Neuroptera, Osmylidae, Nymphidae) from the Lower Cretaceous Burmese amber and Crato Formation in Brazil |journal=Cretaceous Research |volume=in press |issue= |pages= |doi=10.1016/j.cretres.2015.10.029}}</ref>  The [[amber]] specimen was recovered from the amber deposits of [[Hukawng Valley]], [[Kachin State]] in Myanmar. The specific origin location for the fossils is unidentified since the amber pieces were obtained from traders after mining.<ref name="Myskowiak2016"/>  Burmese amber has been [[radiometric dating|radiometrically dated]] using [[Uranium|U]]-[[Lead|Pb]] isotopes, yielding an age of approximately 98.79 ± 0.62 &nbsp;million years old, close to the [[Aptian]]&nbsp;– [[Cenomanian]] boundary, in the earliest Cenomanian.<ref name="Shi2012">{{cite journal |last1=Shi |first1=G. |last2=Grimaldi |first2=D.A. |last3=Harlow |first3=G.E. |last4=Wang |first4=Ji. |last5=Wang |first5=Ju. |last6=Yang |first6=M. |last7=Lei |first7=W. |last8=Li |first8=Q. |last9=Li |first9=X. |year=2012 |title=Age constraint on Burmese amber based on U-Pb dating of zircons |journal=Cretaceous Research |volume=37 |pages=155–163 |doi=10.1016/j.cretres.2012.03.014}}</ref><ref name="Barden2013">{{cite journal |last1=Barden |first1=P. |last2=Grimaldi |first2=D. |year=2013 |title=A New Genus of Highly Specialized Ants in Cretaceous Burmese Amber (Hymenoptera: Formicidae) |journal= Zootaxa |volume=3681 |issue=4 |pages=405–412 |url=http://www.mapress.com/zootaxa/2013/f/zt03681p412.pdf |doi=10.11646/zootaxa.3681.4.5}}</ref> <eod>
<sod>When first described, ''R. cratoensis'' was known from a pair of fossil adults,  the [[holotype]] number "HUANG-BP-B-4220" and [[paratype]] number "HUANG-NIGP163028". At the time of the insects' description, the two specimens were residing in the [[Chinese Academy of Sciences|Chinese Academy of Sciences's Nanjing Institute of Geology and Paleontology]], in [[Nanjing]].  Both the winged adults are preserved as [[Inclusion (mineral)|inclusions]] in transparent chunks of yellow [[Burmese amber]] shaped and polished before study.<ref name="Myskowiak2016">{{Cite journal |last1=Myskowiak |first1=J. |last2=Huang |first2=D. |last3=Azar |first3=D. |last4=Cai |first4=C. |last5=Garrouste |first5=R. |last6=Nel |first6=A. |year=2016 |title=New lacewings (Insecta, Neuroptera, Osmylidae, Nymphidae) from the Lower Cretaceous Burmese amber and Crato Formation in Brazil |journal=Cretaceous Research |volume=in press |issue= |pages= |doi=10.1016/j.cretres.2015.10.029}}</ref>  The [[amber]] specimen was recovered from the amber deposits of [[Hukawng Valley]], [[Kachin State]] in Myanmar. The specific origin location for the fossils is unidentified since the amber pieces were obtained from traders after mining.<ref name="Myskowiak2016"/>  Burmese amber has been [[radiometric dating|radiometrically dated]] using [[Uranium|U]]-[[Lead|Pb]] isotopes, yielding an age of approximately 98.79 ± 0.62 &nbsp;million years old, close to the [[Aptian]]&nbsp;– [[Cenomanian]] boundary, in the earliest Cenomanian.<ref name="Shi2012">{{cite journal |last1=Shi |first1=G. |last2=Grimaldi |first2=D.A. |last3=Harlow |first3=G.E. |last4=Wang |first4=Ji. |last5=Wang |first5=Ju. |last6=Yang |first6=M. |last7=Lei |first7=W. |last8=Li |first8=Q. |last9=Li |first9=X. |year=2012 |title=Age constraint on Burmese amber based on U-Pb dating of zircons |journal=Cretaceous Research |volume=37 |pages=155–163 |doi=10.1016/j.cretres.2012.03.014}}</ref><ref name="Barden2013">{{cite journal |last1=Barden |first1=P. |last2=Grimaldi |first2=D. |year=2013 |title=A New Genus of Highly Specialized Ants in Cretaceous Burmese Amber (Hymenoptera: Formicidae) |journal= Zootaxa |volume=3681 |issue=4 |pages=405–412 |url=http://www.mapress.com/zootaxa/2013/f/zt03681p412.pdf |doi=10.11646/zootaxa.3681.4.5}}</ref> <eod>