Sphaeronema californicum

Sphaeronema californicum	Contents	Rev 12/17/2024
	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:

      Chromadorea
       Rhabditida
       Tylenchina
        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)

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:

Distribution:

Tomales Bay, and several other locations in California.

Hosts:

California Laurel (Umbellularia californica) and Arctostaphylos sp..

For an extensive host range list for this species, click

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click

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.