HERE. I don't know if this checkerspot occurs at Kinnikinnick Fen, but I'd be kind of surprised if it didn't.
Swamp Thistle hosts a very rare (for Ohio) butterfly, the Swamp Metalmark (Calephelis muticum). As far as I know, this metalmark has not been seen in the state since 2010. I got to visit that population that year, and wrote about it HERE. It'd be an awesome rediscovery at Kinnikinnick Fen, or anywhere else.
Kudos to the Ross County Park District for protecting this gem, and I look forward to future visits to Kinnikinnick Fen.