Pterotylenchus

Pterotylenchus	Contents	Rev 09/13/2023
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Pterotylenchus Menu	Economic Importance	Damage
	Distribution	Management
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Classification:

Tylenchida
       Tylenchina
        Tylenchoidea
         Anguinidae

Pterotylenchus Siddiqi & Lenne, 1984

Type species of the genus: Pterotylenchus cecidogenus Siddiqi & Lenne, 1984

Synonyms:
None.

Morphology and Anatomy:

Pterotylenchus is close to Ditylenchus in its general appearance, its esophagus is similar to some species of Ditylenchus that were formerly classified as Nothotylenchus and Orrina.
The ovary differs from Ditylenchus mostly in the columned uterus, similar to Subanguina, and the presence of cuticular vulval flaps; this is the only known genus in Anguinidae which has vulval flaps.
Pterotylenchusis is similar to Orrina in general motphology but differes in lacking a median esophageal bulb and in the presence of vulval flaps.

Small nematodes (<1 mm).
Cuticle striated. Lateral fields with four incisures, inner ones close together.
Lip region smooth, low, continuous with body contour
Stylet small (about 10 um); distinct rounded knobs.
Esophageal corpus nearly cylindrical; posterior region slightly swollen but median bulb not differentiated, lacking musculature and valve plates.
Basal bulb elongate-saccate, with dorsal esophageal gland extending over intestine for about one body diam.
Deirids present.

Female:

Vulva a transverse slit partly covered by large cuticular flaps.
Ovary outstretched with oocytes mostly in single file; columned uterus with four rows of 8-9 cells.
Crustaformeria of 32-36 cells
Short post-vulval uterine sac
Tail elongate-conoid, with a pointed tip.

Second-stage juveniles similar to females in lip region, stylet, esophagus, and tail. Dorsal gland making only a short overlap on intestine, tail less sharply pointed than in adult.

Ref: Siddiqi and Lenne (1984)

Cuticular flaps partly covering the vulva of Pterotylenvhus cecidogenus
Scanning elecron micrograph from Siddiqi and Lenne (1984)
Scale bar = 5um

Males: Unknown

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

Feeding:

A stem gall nematode on the tropical pasture legume Desmodium ovalifolium

Hosts:

Desmodium ovalifolium is the type host. of P. cecidogenus. Many cultivars produced by CIAT are susceptible, to P. cecidogenus, but several are resistant (Stanton et al., 1990).

For an extensive host range list for this genus, click

Life Cycle:

For Ecophysiological Parameters for this genus, click

The stem galls are not easily detectable; they form at nodes and divisions in the stem. The galls cause considerable disruption of the vascular system and eventually to death of the plants.(Siddiqi and Lenne, 1984).

Arrows point to galls caused by Pterotylenvhus cecidogenus on stems of Desmodium ovalifoliun
Photograph froSiddiqi and Lenne ( 1984)

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Management:

Resistant cultivars.

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References:

Fortuner and Maggenti, 1987. Rev. Nematol. 10(2):163-176.

Siddiqi, M.R. and Lenne, J.M. 1984. Pterotylenchus cecidogenus n. gen., n. sp., a New Stem-gall Nematode Parasitizing Desmodium ovalifolium in Colombia. J. Nematol. 16:62-65

Stanton, J. M., C. A. Garcia and C. Torres. 1990. Resistance and tolerance of Desmodium of ovalifolium to Pterotylenchus cecidogenus, the stem gall nematode. Nematologica 36:424-433.

Pterotylenchus

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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Economic Importance:

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Feeding:

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Hosts:

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Life Cycle:

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Damage:

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Management:

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References:

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Copyright © 1999 by Howard Ferris.
Revised: September 13, 2023.

Pterotylenchus

Copyright © 1999 by Howard Ferris. Revised: September 13, 2023.

Copyright © 1999 by Howard Ferris.
Revised: September 13, 2023.