Cephalenchus leptus




Rev 02/05/2021

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Cephalenchus leptus  Siddiqi, 1963

Originally described as Tylenchus (Cephalenchus) leptus Siddiqi, 1963

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Morphology and Anatomy:


Cephalenchus leptus (from Siddiqi, 1963)

1. Cephalic end of female; 2. Amphid and sensillar sac; 3. Cross-section of head showing sclerotization of amphidial pouches; 4. Oesophageal region of female; 5. Female  6. Caudal end of female .

  • Body much attenuated;
  •  lip region 1/3 of the body-width at neck base,
  • long filiform tail.
  • Cuticle  coarsely striated; annules distinct, 2um wide near mid-body.
  • Lateral fields interrupting transverse striations, marked by six longitudinal incisures,
  •  Deirids a pair of distinct pores, located in the middle of lateral fields at the level of the excretory pore
  • Head rounded, set off from body by a deep constriction,
  •  Oral opening small, oval, surrounded by six amalgamated lips; lateral lips enlarged, bearing small, oval amphidial apertures. Amphids with abnormally sclerotized pouches;
  • Stylet slender, 17um long, 17% of esophageal length, conus slighlty than shaft; basal knobs distinct, with outer margins directed outward and forward
  • DEGO 2 um from base of spear.
  • Procorpus of esophagus short and broad, equal to spear in length. Metacorpus well-developed, rounded,
  • Sub-ventral esophageal glands opening just posterior to thickening in center of metacorpus.
  •  Isthmus slender, elongate, twice the length of procorpus,
  •  Basal oesophagcal bulb sac-like, with three gland nuclei, slightly extending over anterior end of intestine the right side
  • Eesophago-intestinal valve conoid-rounded.
  •  Excretory pore located one body-width behind the level of the metacorpus.
  • Vulva a depressed transverse slit; vagina leading inwards, at right angles to body axis; posterior uterine sac 20um long, about 1.5x vulval body diameter.
  •  Spermatheca absent; no trace of sperms in uterus.
  • Tail long, filiform, much attenuated, 27 times anal-body-width long; tail terminus acuminate.


Ref: Siddiqi, 1963

Refer to subfamily diagnosis (Tylodorinae)

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

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Described from soil around the roots of a cedar tree (Cedrus libani) and also Pinus wallichiana and Pinus roxburghii in North India at elevation 7,000 ft asl.(Siddqi, 1963).

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Economic Importance:


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Ectoparasites of plant roots, root hairs, algae, etc. 



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For an extensive host range list for this species, click


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Life Cycle:

Based on absence of males and absence of sperm in female genital tract, probably parthenogenis.

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters



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For plants reported to have some level of resistance to this species, click


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Siddiqi, 1963. Four new species of the genus Tylenchus Bastian , 1865 (Nematode) from North India. Z. f. Parasitenkunde 23:170-180.

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Copyright © 1999 by Howard Ferris.
Revised: February 05, 2021.