• Free-living marine nematodes
• Pharynx largely cylindrical with terminal bulb well defined or weakly developed (e.g. Dracogalerus, Notochaetosoma); medium swelling of corpus present in Dracognomus.
• Swollen anterior body region usually marked;
• Helmet present (except in Dinetia).
• Cephalic adhesion tubes with or without swollen base at insertion and with or without open tip; located on helmet or posterior to helmet.
• Buccal cavity small or moderately to well developed with one dorsal tooth, with or without two small subventral teeth; exceptionally narrow and unarmed in Dinetia, Dracogalerus, Notochaetosoma.

Ref:  Decraemer et al., 1997