Anderson, R.V. & Mulvey, R.H., 1979
Plant Parasitic Nematodes in Canada
Part 1: "An illustrated key to the genera" can be downloaded from the Entomological Society of Canada's website.
The key refers to the photographs which illustrate most alternatives.
||Entomological Society of Canada
||Half-tone photographs at the back.
||Under a Compound Microscope (also useful to examine under a Stereo Microscope).
||Specimens killed by gentle heat (p16), fixed in 2-4% formalin and mounted in glycerol or lactophenol.
||A good microscope with at least phase contrast and probably differential interference contrast (DIC) is needed to make out minute structural details of hyaline tissues.