Apratylenchoides

Apratylenchoides	Contents	Rev 09/11/2023
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Apratylenchoides Menu	Economic Importance	Damage
	Distribution	Management
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Classification:

       Tylenchina
        Tylenchoidea
         Pratylenchidae
          Pratylenchinae

Apratylenchoides Sher, 1973

Type species of the genus: Apratylenchoides belli Sher, 1973

Synonyms:
None.

Apratylenchoides can be distinguished from Pratylenchoides Winstow, 1958 (which Sher considered closely related), by having only one ovary and no deirids. However, Pratylenchoides has since been moved to the Merlinnidae. Apratylenchoides can be distinguished from Pratylenchus by the large dorsal and small ventral lobe of the esophageal glands, the usually more posterior position of the dorsal esophageal gland opening, and usually more anterior position of the median bulb; and from Antarctylus Sher, 1973, by the single ovary and shape of the lip region and female tail. (Sher,1973).

Lip area flattened anteriorly, characterized (with SEM) by the complete fusion of the lip sectors with and by a distinct rounded oral disc.
The dorsal esophageal gland opening is situated at some distance (6 um) from stylet.
The dorsal gland and one subventral gland form a large compact lobe overlapping the intestine dorsally and laterally. The other subventral gland forms a short ventral lobe. The three esophageal gland nuclei are situated posterior to the conspicuous esophago-intestinal valve.
Deirids absent.
Phasmids on the posterior half of tail.

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Female:

Posterior genital branch reduced to a postvulvar sac
Tail length about twice the anal body diameter. Cuticle not markedly thickened at tail extremity.

Male:

Secondary sexual dimorphism weak, affecting the esophagus, slightly reduced in male.
Gubernaculum not protruding.
Caudal alae terminal.

[Ref: Luc, (1987).]

Body size range for the species of this genus in the database - Click:

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Distribution:

Two genera, A. belli and A. homoglans, are reported from faba bean in Iran. A. homoglans is described as a parasite of the roots of chrysanthemun in India (Azimi et al., 2014; Siddiqi et al., 1991).

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Economic Importance:

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Feeding:

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Hosts:

For an extensive host range list for this genus, click

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Damage:

Apratylenchoides homoglans is reported to cause browning in chrysanthemum roots at initial stages of infection which later leads to blackening of the whole root (Siddiqi et al., 1991).

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Management:

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References:

Azimi, S., Mahdikhani-Moghadam, E., Rouhani, H., Memari, H.R. 2014. The rare genus Apratylenchoides Sher, 1973 (Nematoda: Pratylenchidae) from faba bean in Iran. Arch. Phytopath and Plant Protection 47:2288-2294.

Luc, Rev. Nematol. 10(2):203-218 (1987).

Siddiqi, M.R., R.M. Khan, P.P. Reddy. 1991.Apratylenchoides homoglans sp. n.(Nematoda: Tylenchina), parasitic on roots of chrysanthemum at Bangalore, India. Afro-Asian Journal of Nematology 1:1-4.

Sher, S.A. 1973. The Esophageal Glands of Pratylenchus Filipjev and Apratylenchoides belli n. gen. n. sp. (Nematoda: Tylenchoidea). J. Nematology 5:218-221.