Gracilacus mira




Rev 02/13/2023

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           Gracilacus mira Raski 1962

      Paratylenchus mirus

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Morphology and Anatomy:


Female:  Small, 0.33 mm, vermiform and slender

Stylet long (77 µm),  flexible.

Tail conoid to pointed.


Juvenile: Stylet present, esophagus well developed.

Male: Unknown.

[Ref: Raski, 1962)

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

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Northern California, vineyard soil.

Contra Costa and Mendocino counties, California.

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Economic Importance:

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Young, vermiform, female inserts its long stylet into root tissues and remains attached to the root surface by the stylet. Nematode feeds in epidermal, cortical parenchyma and sclerenchyma cells. Feeding induces cell wall thickening.

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Type host: Grape, Vitis vinifera, on St. George rootstock.

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

Young, vermiform, female inserts its long stylet into root tissues and remains attached to the root surface by the stylet. Female body swells as gonads mature. Eggs are deposited in a gelatinous matrix which surrounds the female, eggs and and newly hatched J2s.


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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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Raski, D.J. 1962.  Paratylenchidae n.fam. with description of five new species of Gracilacus n.g. and an emendation of Cacopaurus Thorne, 1943, Paratylenchus Micoletzky, 1922 and Criconematidae Thorne, 1943.  Proc. Helminthol. Soc. Washington 29:189-207.

Raski, D.J. 1976. Revision of the Genus Paratylenchus Micoletzky, 1922 and Descriptions of New Species. Part III of Three parts--Gracilacus. J. Nematology 8:97-115.

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