Geocenamus angelescresti  

  

Contents

  

Rev 11/19/2019

  Classification Hosts
Morphology and Anatomy Life Cycle

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 Economic Importance Damage
Distribution Management
Return to Merliniidae Menu Feeding  References
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Classification:

Rhabditida
       Tylenchina
        Tylenchoidea
           Merliniidae
             Merliniinae

                     Geocenamus angelescresti Chitambar and Ferris, 2005

 

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Morphology and Anatomy:

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 Characterized by a round to hexagonal labial disc with six bulging sectors, lateral sectors of first labial annule smaller than the submedian sectors, six to eight labial annules.

Distinct deirids.

Stylet length 45-57 µm, cone greater than half the length.

Body length 666-996 µm.

Lateral field with or without areolation of outer bands on tail, and a rounded.

Smooth tail terminus. 

Labial region bulbous.  SEM face view with well-marked, round labial disc.  First lip annule divided into six sectors, lateral sectors smaller.  Labial framework weakly developed.  


 

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

 
   
Photographs by John Chitambar, CDFA
Male: Similar to female but more ventrally arcuate. 

Spicules proximally straight, distal quarter ventrally curved. 

Gubernaculum crescent-shaped, not protruding from cloaca, thickened distally, tapered, narrow proximally.

Bursa peloderan, finely annulated.

[Ref: Chitambar and Ferris (2005).]
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Distribution:

San Gabriel Mountains of southern California

 

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Economic Importance:

 

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Feeding:

Migratory ectoparasite. 

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Hosts:

 Pinus ponderosa (western yellow pine) and Arcotostaphylos patula (greenleaf manzanita).
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:

Chitambar, J.J. and H. Ferris. 2005. Geocenamus angelescresti n. sp., a diagnostic key and compendium to the species of the genus Geocenamus Thorne and Malek, 1968 (Nematode Belonolaimidae) Journal of Nematology 37:429-437.

 

 

 

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Copyright © 1999 by Howard Ferris.
Revised: November 19, 2019.