Diplolaimelloides

  

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Rev: 09/16/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Diplolaimelloides Menu Ecosystem Functions and Services
Distribution Management
Return to Monhysteridae Menu Feeding  References
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Classification:

Chromadorea
  Chromadoria
   Monhysterida
Monhysterina
Monhysteroidea
            Monhysteridae
Diplolaimellinae
       Diplolaimelloides Meyl, 1954

Type species of the genus: Diplolaimelloides altherri Meyl, 1954

    Synonyms:
     

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Morphology and Anatomy:

Members of the subfamily Diplolaimellinae of the Monhysreidae are charcaterized by a double buccal cavity at some point during their juvenile or adult stages, while those in the other subfamily, the Monhysterinae, have a single tapered buccal cavity.

The genus Diplolaimelloides was erected by Meyl (1954) for those Diplolaimella species in which the male has a genital bursa with fine genital papillae (Chen et al., 2023)..

Presence of a copulatory bursa in males is an important character distinguishing  Diplolaimelloides.  Diplolaimella clearly differs from Monhystrium, Tripylium, and Diplolaimelloides (in the same subfamily) by the absence of a male copulatory bursa and the presence of an apophysis on the gubernaculum (Shimada et al., 2022).

Several species of Diplolaimella and/or Diplolaimelloides are considered species inquirendae because a male has not beenj described and the presence or absence of a bursa or apophysis on the gubernaculum is unknown (Shimada et al., 2022)..

 

 
  • Buccal cavity divided into two chambers:
  • Outer labial and cephalic sensillae small, setiform.
  • Amphidial fovea cryptospiral
  • Ventral gland mostly present, opening anterior to nerve ring (mid-pharynx).
  • Ocelli usually present, varying in position from anterior end. 
  • Pharynx muscular, gradually widened to posteriorly but without terminal bulb. Cardia distinct
  • Spinneret present at tail tip
  • Tail with cylindrical posterior section.

Females:

  • Monodelphic, prodelphic, ovary outstretched,
  • Vulva located in the mid-body region of long-tailed species, and more posterior in shorter-tailed ones.

Ref: Shimada et al., 2022; Chen et al., 2023.

Males:  

  • Monorchic; testis outstretched
  • Bursa present encompassing the anterior portion of the tail and supported by several pairs of fine postcloacal papillae.
  •  Spicules slender, arcuate to almost straight, varying in length from 1.8 to 4.4 cbd.
  • Gubernaculum weakly sclerotized, without dorsal apophysis.

 

Body size range for the species of this genus in the database - Click:
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Distribution:

Free-living marine nematodes; intertidal areas, brackish water, mangrove swamps.

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Feeding:

Bacterial and probably epistrate feeders. Often reported from sediment in muddy tidal flats.

 
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Biology and Ecology:

Life Cycle:

For Ecophysiological Parameters for this genus, click 
 
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Ecosystem Functions and Services:

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Management:

 
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References:

Allgen, C. 1929.. Sudschwedische marine Nematoden. Goteborgs kungliga vetenskaps-och vitterhets-samhalles Handlingar. Femte Foljden Ser B 1(2): 1-40.

Chen, Y., Zhu, H., Guo, Y. 2023. A new species and a new record of free-living marine nematode of genus Diplolaimelloides (Monhysteridae) from Futian mangrove reservation in Shenzhen, China. Journal of Oceanology and Limnology 41: 314-326,  https://doi.org/10.1007/s00343-021-1206-7

Meyl, A. H. 1954. Die fadenwurmer (Nematoden) einiger Salztellen sudöstlich von Braunscheweig. Abhandlungen der Braunschweigischen Wissenschaftlichen Gesellschaft 6: 84-106.

Pastor de Ward, C.T. and Lo Russo, V. 2009.. Distribution of Diplolaimella and Diplolaimelloides species from Patagonian lagoons and coastal waters (Nematoda: Monhysteridae), Chubut and Santa Cruz provinces (Argentina). Journal of the Marine Biological Association of the United Kingdom 89:711-718. DOI: 10.1017/S0025315409000198

Shimada, D., Komiya, T., Yoshiga, T. 2022. A new species of free-living marine nematode, Diplolaimella ariakensis n. sp. (Nematoda: Monhysteridae) from the Ariake Sea, Japan. Nematology 24:321-331.

Timm, R.W. 1967.. Some observations on the nematode genera Diplolaimella and Diplolaimelloides. Proceedings of the Pakistan Academy of Sciences 3:114-125

 

 

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Copyright © 1999 by Howard Ferris.
Revised: September 16, 2023.