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 Key to genera of PHILOMETRIDAE 1 Body elongate, claviform; oesophageal gland limited to middle of oesophagus............................. Clavinema - Body cylindrical, long; oesophageal gland more or less extensive.............................................. 2 2 Dorsal oesophageal gland developed along greater posterior portion of oesophagus; anterior muscular portion more or less swollen anteriorly, without free posterior glandular appendix ; anterior ovary not rudimentary........................ 3 - Anterior muscular portion of oesophagus elongate, with two swellings separated by nerve ring, with free posterior glandular appendix ; anterior ovary rudimentary............................................................ Ichthyofilaria 3 Body of female covered with prominent cuticular bosses.......................................... Philometroides - Body of female smooth, without cuticular bosses........................................................... 4 4 Posterior end of both sexes rounded; anus of male terminal; gubernaculum present......................... Philometra - Posterior end of both sexes tapering to a sharp point; tail of male coiled, anus remote from tail tip; gubernaculum absent............................................................................................... Philonema