Gordian worms! Notice that one end works like a “holdfast” or anchor attaching to the gravel or a leaf. The Nematomorph photographed on the 26th was there in the same place on the 27th (we put it back after its photo-op) and it was still there on the 28th along with others. I am wondering if the mass of spaghetti-looking things in the photo of the Collembola are actually a “nest” of the Nematomorphs. And, there are two species of Collembola in there; the orange ones are Sminthurus.
Is this a nest or hatchery or is it just grass? Notice the two species of Collembola.