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Mycophagous Nematode Worm

Scientific Name
Aphelenchus avenae
Scientific Author
Bastian, 1865
(Nematoda: Aphelenchida: Aphelenchidae: Aphelenchinae)
Pest Status
0 Unknown
0 Unknown
NZ - Exotic
NZ - Exotic

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Diagnostic Images

Pharyngeal Region - Female
Slide mounted
Zeng Zhao Landcare Research
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Diagnostic Images (7)
Diagnostic Notes

Body cylindrical. Cephalic region bluntly rounded to flattened, not offset from body. Lateral field wide in mid-body region with 12 (10-14) incisures. Anterior conical part of stylet slightly shorter than the less refractive posterior part which is slightly thickened but not knobbed at its base. Median bulb widening abruptly from procorpus, well developed, rectangular to oval in shape. Dorsal lobe of oesophageal glands usually well developed, but it can vary in length from very short to up to 100 µm long. Genital tract monoprodelphic, outstretched, oocytes in a partly single, partly double row. There is also a postuterine sac reaching about half-way from the vulva to the anus; which is often flattened dorsoventrally and is sometimes difficult to see. Anterior lip of anus protrudes slightly; tail usually bluntly rounded about 1.75 anal body widths (abw) long, but may vary between 1.5 and 2.5 abw long; a pair of subterminal phasmids usually visible.


Similar to female except for sexual dimorphism. Spicules slender, 28-30 µm long, paired, separate, cephalated, ventrally curved and gradually tapering toward the pointed distal ends. Gubernaculum present, 14-16 µm long with a narrow proximal end in lateral view that abruptly widens into the main part which gradually tapers to the distal end. Tail conical and enveloped by a bursa arising opposite the head of the spicules; four pairs of bursal papillae (ribs) present, one pair adanal and the other three towards the tail end. In many populations males are absent or extremely rare.


Oesophageal region, tail and overall shape of second to fourth stages similar to the female. The number of lateral incisures increases from four in the second stage to eight in the fourth stage.


- Hunt, D.J. (1993). Aphelenchida, Longidoridae and Trichodoridae: Their Systematics and Bionomics. University Press, Cambridge, 352pp

More Information
Specimen Contact
MAF Plant Health & Environment Laboratory (Nematode collection held by Zeng Zhao at Landcare Research)
Zhao, Z. Q. & Crosby, T. K.
25/05/2011 02:09 AEST
Last Updated
19/03/2014 19:35 AEST
Zhao, Z. Q. & Crosby, T. K. (2011) Mycophagous Nematode Worm (Aphelenchus avenae) Updated on 3/19/2014 7:35:50 PM Available online: PaDIL -
Image Use
Free for use under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)