Examples are shown in the following table. Most of the nematodes of veterinary importance are found in the six orders and thirteen superfamilies listed in the table below. The two images below show nematodes with and without a copulatory bursa. Tail end of male showing copulatory bursa, spicules and bursal rays. Click here to view a table showing a more complete classification of nematodes of veterinary importance.
Sources There are several good Web sources that describe taxonomic hierarchy.