Favoritos de cornerautenbach

Tachysphex and sand-loving wasp fighting on Queen Anne's lace. The first shot was from their most serious engagement. Seemed to be initiated by the tachysphex that landed on the other wasp. After this the tachyspex continued to swoop at all other occupiers of the Queen Anne's lace (white spotted chafer, honey bee, flower wasp and seladonia). This obs is for the sand-loving wasp. Obs for the tachysphex is here: https://www.inaturalist.org/observations/196018684

I need your help. I can't figure out who it is. There is an assumption that there is also some kind of Aciagrion. But the abdomen is noticeably shorter than that of A. gracile and the dragonfly itself was smaller. Merlot Park, a reservoir devoid of any coastal vegetation. This dragonfly kept grass 1-2 meters from the shore together with A. gracile and Ceriagrion glabrum. While there is tolkyo this photo. Perhaps it will be even when I get to the photos from the camera. Any ideas? And could it be some form of A. gracile?

The description fits perfectly, but the appendages are not visible. It is quite obvious that it is Aciagrion, but not A. gracile. There are apparently no other options for this area. Also a photo of this dragonfly with discussions: https://www.inaturalist.org/observations/148445031