Adoncholaimus

  

Contents

  

Rev 08/28/2026

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Morphology and Anatomy Life Cycle
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Classification:
Enoplea
     Enoplia
        Enoplida
Oncholaimina
              Oncholaimoidea
                    Oncholaimidae
Adoncholaiminae

Adoncholaimus Filipjev, 1918

Type species of the genus: Adoncholaimus fuscus (Bastian, 1865) Filipjev, 1918

Synonyms:

Oncholaimus Bastian, 1865

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Morphology and Anatomy:

  
Adoncholaimus ussuriensis  A: Entire male, lateral view; B: Entire female, lateral view; C: Head of  male, lateral view; D: Posterior body of male, lateral view; E: Terminal pore of the Demanian system, lateral view.
(Scale bars: A, B = 500 um; C, E = 50 uμm; D = 200 um)
Drawings from Mordukhovich et al., 2015		  

General Characteriistics of Genus:

  • Body length 2-7 mmBuccal cavity large, with three oncjia, right ventrosublateral onchium largest,
  • Tail anteriorly conical, posteriorly cylindrical.   Midventral supplement present or not.
  • Marine, brackish and freshwater.

Female:

  • Didelphic, amphidelphic, antidromously reflexed.
  • Vulva at mid-body
  • Demanian system present, parallel to intestine and reproductive system, terminal pores with short terminal ducts opening on body cuticle in preanal region, main duct connected anteriorly with intestine through ductus entericus and osmosium, also connected with reproductive system by ductus uterinus, uvette present or absent.

Male:

  • Diorchic, testes outsretched
  • Spicules equal to cbd or longer (up to 13 times), bent ventrally in distal part,
  • Gubernaculum present or absent.

Ref: Mordukhovich et al., 2015; Smol et al., 2014; Huang and Guo, 2022
Body size range for the species of this genus in the database - Click:
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Distribution:

Free-living marine  nematodes. Reported from intertidal muddy sediments and from mangroves.

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Economic Importance:

 

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Feeding:

Food Sources and Feeding strategies for the genus Adoncholaimus

 

     Probably omnivore-predators with large stoma and sharp teeth (Heip et al., 1985; Tchesunov, 2015)

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Life Cycle:

For Ecophysiological Parameters for this genus, click 
 
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Damage:

 

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Management:

 

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References:

Heip, C., Vincx, M., Vranken, G. 1985. The ecology of marine nematodes. Oceanography and marine biology. Ann Rev Lond 23:399-489

Huang, Y. and Guo, Y. 2022. Free-living Marine Nematodes from the East China Sea, https://doi.org/10.1007/978-981-16-3836-7_10

Mordukhovich, V., Atopkin, D., Fadeeva, N., Yagodina, V., Zograf, H. 2015. Admirandus multicavus and Adoncholaimus ussuriensis sp. n. (Nematoda: Enoplida: Oncholaimidae) from the Sea of Japan. Nematology 17:1229-1224

Smol, N., Muthumbi, A., Sharma, J. 2014. Order Enoplida, 7.3. In Schmidt-Rhaesa, A. (ed) Handbook of Zoology. De Gruyter, Berlin

Tchesunov, A.V. 2015. Free-living nematode species (Nematoda) in hydrothermal sites of the North Mid-Atlantic Ridge. Helgoland Marine Research 69:343-384.

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Revised by Howard Ferris: August 28, 2026.