KEYS to NEMATODA The following keys are designed to aid identification of larval and/or adult nematodes recovered from Canadian fishes from any aquatic environment, be it fresh water, brackish water or marine. The keys may be unsuitable for identifying material from other areas. A single asterisk (*) preceding a nematode’s scientific name denotes that the taxon has been recorded only in its larval stage in given fish host(s), a double asterisk (**) denotes records of both larvae and adults in given host(s), whilst an unadorned taxon denotes records of only adults in given host(s).

Published as part of Arai, Hisao P. & Smith, John W., 2016, Guide to the Parasites of Fishes of Canada Part V: Nematoda, pp. 1-274 in Zootaxa 4185 (1) on page 17, DOI: 10.11646/zootaxa.4185.1.1, http://zenodo.org/record/165530