Guide to the Parasites of Fishes of Canada Part V: Nematoda Author Arai, Hisao P. Author Smith, John W. text Zootaxa 2016 4185 1 1 274 journal article 10.11646/zootaxa.4185.1.1 11620862-ddcf-4c01-b0d9-32867e03d74b 1175-5326 165530 0D054EDD-9CDC-4D16-A8B2-F1EBBDAD6E09 Philometra Costa , 1845 Generic diagnosis (after Yamaguti 1961 ). Philometridae . Males much smaller than females (males of some species unknown). Body filiform, anterior and posterior ends rounded. Mouth with or without lips. Head and tail papillae present or absent. Oesophagus cylindrical, short, bulbous at anterior end. Oesophageal gland confined to wall of oesophagus. Males with spicules equal, or almost so, slender; gubernaculum present. Vulva of gravid worms atrophied. Uteri occupy most of body. Ovaries amphidelphic. Parasites of body cavity and tissues of fishes.