From ZooTerms (Dictionary of Invertebrate Zoology)
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stomatostyle also stomatostylet (noun; Greek stoma, mouth; stylos, pillar): (NEMATA: Secernentea) A stylet or protrusible hollow spear found in fungus feeding plant parasitic and insect parasitic nematodes of the suborders Tylenchina and Aphelenchina, presumed to have evolved from the walls of the stoma.