Geocenamus angelescresti  




Rev 11/19/2019

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Morphology and Anatomy Life Cycle

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                     Geocenamus angelescresti Chitambar and Ferris, 2005


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Morphology and Anatomy:


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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San Gabriel Mountains of southern California


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Economic Importance:


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Migratory ectoparasite

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 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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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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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.