Malenchus gilanensis




Rev 07/26/2022

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           Malenchus gilanensis Jalalinasab, Adeldoost, Abolafia, Heydari, 2019


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Morphology and Anatomy:


Refer to subfamily diagnosis (Tylenchinae)

  •  Body straight or slightly ventrally curved, tapering gradually behind vulva.

  • Cuticle with narrow annuli, 0.8to.9um wide at mid-body.

  • Lateral fields with two lines, originating at level of median bulb and almost reaching the middle of the tail

  •  Lip region narrower than body contour with fine striations, 4 to5um wide.

  • Amphidial apertures straight, as in members of subgenus Telomalenchus.

  • Stylet delicate, with rounded knobs directed backwards and conus about one-third of total length.

  • DEGO about 1 um behind base of stylet.

  • Esophagus with muscular, valved median bulb, slender isthmus and pyriform basal bulb .

  •  Excretory pore near level of anterior part of basal bulb.

  • Deirids located almost at level of excretory pore. 

  • Tail in both sexes straight, conical with finer annuli posterior to terminus of lateral field.

  • Females:
  • Monodelphic-prodelphic, ovary outstretched with one row of oocytes.
  • Spermatheca rounded to oval, offset and filled with rounded sperm cells.
  • Post-vulval uterine sac small and about one third of vulval body width long.
  • Vulva sunken into body, with large lateral flaps.



  • Body smaller than female.
  • Testis single, spermatogonia arranged in single row.
  • Spicules sickle-shaped.
  • Bursa adcloacal, with crenate margins, very small, appearing as a partial expansion of the lateral fields.
  • Gubernaculum 4to5 um long.


Ref: Jalalinasab et al., 2019

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

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Described from samples of wood from a dead pine tree (Pinus nigra) in a forest in northern Iran.

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Economic Importance:


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For an extensive host range list for this species, click


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Life Cycle:

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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Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

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



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Geraert, E. 2008. The Tylenchidae of the World. Identification of the Family Tylenchidae (Nematoda). Ghent, Belgium, Akademia Press

Geraert & Raski, (1987) Rev. Nematol. 10(2):143-161.

Jalalinasab, P., Adeldoost, Y., Abolafia, J., Heydari, R. 2019. Description of Malenchus gilanensis n. sp. from Iran. Zootaxa 4638:562-570.

Khera, S., Zuckermann, B.M. (1963). In vitro studies of host-parasite relationships of some plant-parasitic nematodes, Nematologica, 9, 1-6.

Mortazavi, P., Heydari, F., Abolafia, J., Castillo, P., Pedram. M. 2021. Morphological and molecular characterization of Filenchus pseudodiscus n. sp. from east Golestan province, north Iran; with an updated phylogeny of Malenchus Andr�ssy, 1968 (Tylenchomorpha: Tylenchidae). J. Nematology 53: DOI:

Pedram, M., Soleymanzadeh, M., Pourjam, E., Mobasserim, M. 2018. Observations on Malenchus gilanensis n. sp. (Rhabditida: Tylenchidae), a morphological and molecular phylogenetic study. Zootaxa 4369:406-418.

Qing, X., Sanchez-Monge, A., Janssen, T., Couvreur, M. and Bert, W. 2016. Description of Malenchus sexlineatus n. sp., new records of three known species of Malenchus Andrassy, 1968 (Nematoda: Tylenchidae) and notes on amphidial aperture development. Nematology 18:155-174.

Qing, X., Bert, W. 2017. Redefinition of Genus Malenchus Andrassy, 1968 (Tylenchomorpha: Tylenchidae) with Additional Data on Ecology. J. Nematology 49:189-206.

Siddiqi, M.R. 2000. Tylenchida. Parasites of Plants and Insects, 2nd edition. Wallingford, UK, CAB International.


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