Description of the Lungworm Otostrongylus Circumlitus (Railliet, 1899) De Bruyn, 1933 (Metastrongyloidea: Crenosomatidae) Found in the Heart of Harbour Seals from Sweden. J. Nematode Morphol. Syst. 2012, 12 (2), J. Nematode Morphol. Syst., 12 (2): 169-175 (2009).