Coomans & Nair, 1975
Diagnosis: Large nematodes (2.3-3.1 mm long), with C-shaped
body. Lateral and ventral body pores quite numerous. Lip region
offset with low conoid lips. Odontostyle long and narrow, with minute
aperture. Guiding ring "double". Anterior part of oesophagus
slender but muscular, with fusiform section in front of nerve ring.
Two parts of oesophagus separated by long isthmus-like section. Muscle
bundles of oesophageal sheath dextrally spiral, but sinistrally spiral
in anteriormost part. Anterior genital branch of female long (about
four body widths). Vulva a transverse slit. Vaginal wall very
narrow distally, but very thick proximally, without sclerotisation.
Males with spaced ventromedian supplements. Spicules very stout.
Tail hemispherical, similar in sexes.
Type and only species: Heynsaxonchium dolichodorum
(Coomans and Nair, 1975) Jairajpuri and Dhanachand, 1979.
Syn.: Axonchium (Heynsaxonchium) dolichodorum
Coomans and Nair, 1975.
Remarks: The subgenus Heynsaxonchium was raised to a genus
by Jairajpuri and Dhanachand (1979).
(Description- Jairajpuri and Ahmad, 1992)