Figure 2 from: Belitz M, Hendrick L, Monfils M, Cuthrell D, Marshall C, Kawahara A, Cobb N, Zaspel J, Horton A, Huber S, Warren A, Forthaus G, Monfils A (2018) Aggregated occurrence records of the federally endangered Poweshiek skipperling (Oarisma poweshiek). Biodiversity Data Journal 6: e29081. https://doi.org/10.3897/BDJ.6.e29081

Figure 2 Temporal profile of the number of Poweshiek skipperling occurrences that were documented on unique days. Survey effort for this species increased in the mid-1990s (Selby 2005, Swengel et al. 2010). Poweshiek skipperling were listed as federally endangered in the United States and Canada in 2014 (COSEWIC - Committee on the Status of Endangered Wildlife in Canada 2014, USFWS - U.S. Fish and Wildlife Service 2014).