Panagrobelus stammeri

Contents

Rev 03/02/2021

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Panagrobelus menu Ecosystem Functions and Services
Distribution Management
Return to Panagrolaimidae menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology

 

 

Classification:

      Chromadorea      Rhabditida                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
         Rhabditia
          Panagrolaimidae

Panagrolaiminae

Panagrobelus stammeri (Schneider, 1866) Thorne, 1937

Synonym: Cephalobus rigida (Schneider, 1866) Oerley, 1880
 
Back to Top

Morphology and Anatomy:

 

 
Female body stouter than that of male. Short cylindrical stoma.  Long tapering corpus with no offset metacorpus.  Valve in postcorpus.  Female monovarial, prodelphic, ovary reflexed, offset spermatheca, with postvulval sac.  Ovary reflexed beyond vulva and almost to level of rectum.  Rapidly moving, very active nematodes.
Fom Gadd and Loos (1943): Female L 0.84-1.45 (1.2)mm; width 30-60 mµ, a=21-31.8, b=4.82-7.15, V=52.5-61% (de Man formulae).  Males shorter and more slender.
 
Tail conical but asymmetrical, shorter on ventral side.    
   
  Male testis reflexed ventrally, spicules curved, gubernaculum present. No caudal alae.

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

 

  
Back to Top

Distribution:

Found associated with decatyinng plant material and, in Sri Lanka, often in dead flower heads of Chrysanthemum, Gaillardia and Zinnia.

 

Back to Top

Feeding:

Bacterivore.

Steiner and Christie (1939) described the movenment and feeding behavior of P. peruensis. Gadd and Loos (1943) reported similar feeding behavior for Panagrobelus stammeri.

Moves with constant turning of head from side to side, ingesting bacteria by alternate dilation and closing of esophageal canal and very rapid pumping action and movement of the valves of the terminal bulb of esophagus.

The nematode is observed to move foreard and backwards on an agar medium with the tail often folded anteriorly during backward motion.  Steiner and Christie (1939) noted that if and bacteria survive passage through the intestine, the nematode will serve as an effective distribution agent due to the constant motion and activity.

 

Back to Top

Biology and Ecology:

 

 

Back to Top

Life Cycle:

Ecophysiological Parameters:

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

Ecosystem Functions and Services:

 

 

Back to Top

Management:

 

Back to Top

References:

Steiner, G. and Christie, J.R. 1939. Nematodes observed on diseased rhizomes of ginger from Peru. Proceedings Helm. Soc. Washington 6:26-29.

Gadd, C.H. and Loos, C.A. 1943. Observations on the life history of the nematode Panagrobelus stammeri. Spolia Zeylanica 43:65-69.

Goodey, J.B. 1963. Soil and Freshwater Nematodes.

Back to Top
Copyright © 1999 by Howard Ferris.
Revised: March 02, 2021 .