Raphidascaroides nipponensis

 

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Rev 02/20/2024

  Classification Hosts
Morphology and Anatomy Life Cycle
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Distribution Management
Return to Raphidascarididae Menu Feeding  References
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Classification

Class:    Chromadorea
SubClass: Spiruria
Order:       Ascaridida
Superfamily: Ascaridoidea
Family:         Raphidascarididae

                          Raphidascaroides nipponensis Yamaguti, 1941

Morphology and Anatomy:

  • Large-sized, yellowish brown to brownish color, some individuals >10 cm long.
  • Cuticle with fine, transverse striations.
  • Lateral alae absent.
  • Anterior with three long lips, approximately equal in size, with inconspicuous post-labial grooves and prominent lateral flanges; proximal part of each lip with four lobes; dorsal lip with two double papillae,
  • Ventrolateral lips each with one lateral amphid, one single papilla and one double papilla
  • Interlabia well-developed, about 25-30% of length of lips.
  • Eesophagus long, slightly broader posteriorly than anteriorly.
  • Nerve ring at about 10.0% of esophageal length; excretory pore just posterior to nerve ring.
  • Ventriculus nearly oval, slightly narrower than posterior region of esophagus; ventricular appendix relatively short.
  • Intestinal caecum absent.
  • Tail sof both sexes conical, tip with a number of very small nodular protuberances.

Ref: Li et al., 2015

Male:

  • Gubernaculum absent.
  • Caudal papillae very small, 18-26 pairs in total; 14-22 pairs precloacal, one pair of paracloacal and 4-5 pairs post-cloacal .
  • Single papilliform, medio-ventral, precloacal ornament present
  • Phasmids present.

Female:

  • Vulva slit-like, located at 26.4-37.5 % of body length.
  • Vagina muscular, directed posteriorly from vulva
  • Uteri coiled posterior to vagina, extending posteriorly to level of rectum.
  • Lateral phasmids not observed.

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

 

  
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Distribution:

Reported from fish in ocean water of Japan and East and South China Sea.

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Feeding:

Parasites of digestive tract of marine fish.

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Biology and Ecology:

 

 

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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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Ecosystem Functions and Services:

 

 

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Management:

 

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References:

Li, L. Zhao W-T., Guo Y-N., Zhang, L-P. 2015. Nematode parasites infecting the starry batfish Halieutaea stellata (Vahl) (Lophiiformes: Ogcocephalidae) from the East and South China Sea. J. Fish Diseases: DOI.ORG/10.1111/jfd.12374

Yamaguti, S. 1941. Studies on the helminth fauna of Japan. Part 33. Nematodes of fishes II. Japanese Journal of Zoology, 9:343-396.

 

 

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