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==History and classification==
''Republica weatbrooki'' was identified from only the [[type specimen]], the [[holotype]], number SR 06-59-08, which is a [[compression fossil]] preserved in the [[Stonerose Interpretive Center]] [[paleoentomology|paleoentomological]] collection. The holotype was found at the Klondike Mountain Formations "B4131" locality,<ref name="Euphaeidae2021"/> also called the "Boot hill" site.<ref name=Pigg2021>{{Cite journal|last1=Pigg |first1=K. B. |last2=DeVore |first2=M. L. |last3=Greenwood |first3=D. R. |last4=Sundue |first4=M. A. |last5=Schwartsburd |first5=P. |last6=Basinger |first6=J. F. |year=2021 |title=Fossil Dennstaedtiaceae and Hymenophyllaceae from the Early Eocene of the Pacific Northwest |journal=International Journal of Plant Sciences |volume=182 |issue=9 |pages=793–807 |doi=10.1086/715633 |s2cid=239036762 }}</ref> The fossil was described by paleontologist S. Bruce Archibald and entomologist Robert Cannings in 2021 and they coined the [[specific name (zoology)|specific epithet]] ''weatbrooki'' as a [[patronym]] honoring Alex Weatbrook who found the fossil and donated it to Stonerose. They chose the genus name as a [[latin]]ized feminine form of the city name Republic.<ref name="Euphaeidae2021"/>
Archibald and Cannings (2022) placed the new genus into the damselfly family [[Euphaeidae]], extending the known range of the fossil lineage in the family to the Ypresian northwestern North American. The placement was based on the angle and thickened appearance in the quadrangle cells distal wall, densely reticulate venation, plus a smoothly "S"-curved CuA vein, which match Euphaeidae while being contrary to the family [[Zacallitidae]]. Within Euphaeidae, ''Republica'' was placed in subfamily [[Eodichromatinae]] based on the presence of enlarged and thickened Ax1 and Ax2 veins near the base of the wing. Of the members of Eodichromatinae, the closest genus to ''Republic'' seems to be ''[[Labandeiraia]]'', known from Ypresian species described from the [[Green River Formation]] in North America and the [[Fur Formation]] and [[Oise Amber]] in Europe.<ref name="Euphaeidae2021"/><ref name="Oise2022">{{cite journal |last1=Nel |first1=A. |year=2022 |title=The second European representative of the epallagid genus ''Labandeiraia'' in the lowermost Eocene Oise amber (Odonata, Zygoptera) |journal=Palaeoentomology |volume=5 |issue=6 |pages=520-523}}</ref> Modern Euphaeidae species are found in the [[Australasian realm|Australasian]], [[Indomalayan realm|Indomalayan]], and [[Palearctic realm|Palearctic]] [[biogeographic realm]]s, while the known fossil record restricted to Europe and North America.<ref name="Euphaeidae2021"/>
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