Sphaeronema californicum

 

Contents

 

Rev 02/23/2024

  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Sphaeronema Menu Economic Importance Damage
Distribution Management
Return to Tylenchulidae Menu Feeding References
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Classification:

      Tylenchida
       Tylenchina
        Criconematoidea
         Tylenchuloidea
         Sphaeronematidae or Tylenchulidae


           Sphaeronema californicum Raski and Sher, 1952

Type species of the genus

    Synonyms:
          Goodeyella (Siddiqi, 1986)
          Tumiota (Siddiqi, 1986)
          Macroposthonia (de Man, 1921)

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Morphology and Anatomy:

Drawings of Sphaeronema californicum from Raski and Sher, 1952

All stages:

  • Excretory pore situated close to level of median bulb.
  • Juveniles with slender body.

Female:  

  • Globose, subspherical with protruding neck that is configured by the cells in which it is embedded.
  • Stylet knobs as simple swellings. 
  • Median bulb prominent
  • Vulva appearing almost terminal,
  • Uterine wall thickened. 

 

 

Male:

  • No stylet. 
  • Monorchic
  • Spicular sheath present.
  • Tail conoid, rounded terminus

 

 [Ref: Raski & Luc, (1987); Ghaderi et al., 2016.] 


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

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Distribution:

Tomales Bay, and several other locations in California.

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Economic Importance:

 
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Feeding:

     
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Hosts:

     California Laurel (Umbellularia californica) and Arctostaphylos sp..

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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Damage:

 

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Management:

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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References:

Ghaderi, R., Geraert, E., Karegar, A. 2016. The Tylenchulidae of the World. Academia Press, Ghent, Belgium

Raski, D.J. and Luc, M. 1987. A reappraisal of Tylenchina (Nematoda) 10. The superfamily Criconematoidea Taylor, 1936. Revue de Nematologie 10:409-444.

Raski, D.J., Sher, S.A. 1952. Sphaeronema californicum, nov. gen. nov, spec. (Criconematiodaem Sphaeronematinae, nov. subfam.) an endoparasite of the roots of certain plants. Proc. Helminth. Soc. Washington 19:77-80.

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Copyright © 1999 by Howard Ferris.
Revised: February 23, 2024.