lasso

From ZooTerms (Dictionary of Invertebrate Zoology)
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lasso (noun; Latin laqueus, snare, noose): 1. (Cnidaria) Fibrils, thought to be contractile, extending down the stalk of a cnidoblast securing the nematocyst.

2. (NEMATA) Circular traps; a threecelled ring of predacious fungi that constrict around a nematode, penetrating the cuticle and ramifying inside the tissue.