AlloionemaAlloionema is a genus of terrestrial nematodes within the family Alloionematidae. Members of this genus often parasitize gastropods, such as A. appendiculatum parasitizing Arion vulgaris in Europe where the slug is invasive.SpeciesAlloionema appendiculatum Schneider, 1859Alloionema luofuensis Huang, Li & Zhao, 2016Alloionema similis Holovachov, Bostrom, De Ley, McDonnell, Alvaredo, Paine & De Ley, 2016