Genus Cephalenchus
Goodey, 1962 (Golden, 1971)
Tylenchus (Cephalenchus Goodey, 1962)
Imphalenchus Dhanachand & Jairajpuri, 1980

Diagnosis:  Pleurotylenchinae.  Body small to moderately large (0.4-1 mm), slender, straight to arcuate upon relaxation.  Cuticle distinctly annulated, without longitudinal ridges other than those in the lateral fields;  lateral fields with six rarely four incisures at midbody, reducing in number to four in postvulval region.  Deirids just behind level of excretory pore.  Prophasmids dorso-sublateral, in females a little anterior to vulval level.  Cephalic region small, low, rounded, offset, rarely continuous, with indistinct annules;  framework with light to moderate sclerotization;  labial disc indistinct, round; amphidial apertures pore-like, labial.  Stylet relatively small (14-22 um) but about as long as percorpus;  knobs distinct. Orifice of dorsal oesophageal glands 2-3 um behind stylet base.  Median oesophageal bulb with refractive thickenings, not offset from precorpus.  Isthmus very long and slender.  Basal bulb pyriform, base (mainly dorsal gland) may extend over intestine.  Vulva transverse, depressed, at 52-70% of body length, usually shifted slightly from mid-ventral line, with lateral membranes.  Postvulval uterine sac prominent.  Spermatheca round to oval.  Ovary outstretched, with single row of oocytes.  Tails elongate-filiform, 85-235 um long.  Male with distinct, adanal bursa often with asymmetrical flaps, a fixed rod-like gubernaculum, cephalated, pointed 15-20 um long spicules, and slightly raised cloacal lips.
Type species: Cephalenchus megacephalus  Goodey, 1962
     Syn.:  Tylenchus (Cephalenchus) megacephalenchus Goodey, 1962

(Description- Siddiqi, 2000)