This is a Jade Clubtail. They look very similar to Unicorn Clubtails, but note the subtle differences between it and the Unicorn Clubtail above. The Jade Clubtail is a softer, minty green, with less black in the pattern, and a reddish-brown club. 

Unicorn Clubtails are typically found around ponds from late May through early July. This is one of the few clubtail species that prefers ponds rather than rivers. 

You would think that something named "unicorn" would be rare, but the Unicorn Clubtail is actually one of our most common clubtails. This dragonfly gets its name from a very tiny horn on its forehead.

Jade Clubtails are much less common than Unicorn Clubtails in Ohio. They were first discovered in the state in 2018 by Jim Lemon. There are three known Ohio locations, all a little north of Dayton: Lake Loramie, Swift Run Lake in Piqua, and Forty Acre Pond in Auglaize County. All of these locations are ponds and lakes along the old Miami-Erie Canal route, and Paulson mentions that this species is found in canals. The Jade Clubtail photos on this page were taken at Swift Run Lake in Piqua on June 28, 2020. 

Unicorn Clubtails are very distinctive due to the golden claspers at the end of the abdomen. The only two similar species in Ohio are the Lilypad Clubtail (not documented in southwestern Ohio) and the Jade Clubtail (discussed below).