Dactylella

Dactylella is a genus comprising 72 species of mitosporic fungi in the family Orbiliaceae. They are notable for trapping and eating nematodes.
Members of this genus form a noose structure from several elongate cells. When stimulated by a nematode passing through the structure, the cells swell, tightening the noose and trapping the nematode. Filaments then grow into the nematode to absorb nutrients.