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 Classes of NEMATODA 1 Phasmids absent; amphids pocket-like; caudal papillae absent or few in number; oesophagus cylindrical or with oesophageal glands free in the pseudocoelom forming a stichosome; excretory system without lateral canals, terminal duct not lined with cuticle........................................................................................ Enoplea - Phasmids present; amphids pore-like; caudal papillae usually numerous (basic number 21); oesophagus never in the form of a stichosome; excretory system with lateral canals, terminal duct lined with cuticle......................... Chromadorea