You searched for: “mesofauna
mesofauna (s) (noun), mesofaunas (pl)
The organism size category between tiny animals and large animals which includes such ground-dwelling creatures as mites, some insects, and their larvae, and springtails (any of numerous minute wingless primitive insects possessing a special abdominal appendage that act as springs to catapult them through the air and presents a nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water).