title: Resurrection of Southwellina Witenberg, 1932, with a description of Southwellina Dimorpha sp. n., and a key to genera in Polymorphidae (Acanthocephala).
mesh_terms: D000818:Animals; D001715:Bird Diseases; D001717:Birds; D006373:Helminthiasis / Q000145:classification*; D006374:Helminthiasis, Animal; D006376:Helminths / Q000033:anatomy & histology; D008322:Mammals