Rev: 12/24/2022

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



             Amphidelus Thorne, 1939


 Etymology:  name refers to readily discernible amphid apertures.    

Back to Top

Morphology and Anatomy:



  • Slender body ranging from 0.9 to 4.2 mm.
  • Cuticle smooth.
  • Head rounded and not offset from body contour.
  • Lips fused; labial papillae small but visible.
  • Anterior sensillae a ring of 6 minute inner labial pits surrounding mouth opening, a circle of more obvious outer labial pits and a circle of 4 cephalic pits which are difficult to see.
  • Mouth opening inconspicuous; stoma very narrow
  • Amphids pocket-shaped with slit or oval aperture; < 2 head diameters behind head.
  • Esophagus gradually widening with 7 gland nuclei in posterior region.
  • Excretory duct, after leaving the excretory cell, splits into two canaliculi which merge  into a single duct before opening through a single excretory pore.
  • Female gonad mostly amphidelphic but in some species prodelphic or opisthodelphic.
  • Vulva lips open; vagina swollen.
  • Tail elongate conoid to filiform; c' = 3 - 22.




  • Rare
  • Monorchic
  • Spicules short and straight.
  • Gubernaculum absent.
  • 2 to 5 ventromedian supplements.

Andrássy, 2009; Clausi and Vinciguerra, 2003

Amphidelidae (L=1.3 mm); Domes Gardens, UC Davis.  Photos by Anna Ruth Crittenden Amphidelidae; esophageal region and amphid apertures

Body size range for the species of this genus in the database - Click:
Back to Top


Back to Top



Back to Top

Biology and Ecology:

Back to Top

Life Cycle:

For Ecophysiological Parameters for this genus, click 
Back to Top

Ecosystem Functions and Services:

Back to Top


Back to Top


Andrássy, I. 2009.  Free-living nematodes of Hungary, III.  Hungarian Natural History Museum.

Clausi, M., Vinciguerra, M.T. 2003. A new nematode species, Brasilaimus lombardoi sp.n. (Actinolaimidae, Dorylaimida) and the male of Amphidelus boa Andrassy, 1968 (Alaimidae, Enoplisa) from Esuador, Nematol. Medit. 31:21-28.


Copyright © 1999 by Howard Ferris.
Revised: December 24, 2022.