Hystrichis		Contents		Rev: 12/09/2024
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Hystrichis Menu				Ecosystem Functions and Services
		Distribution		Management
Return to Dioctophymatidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria

           Rhabditida 

                       Spirurina

                          Dioctophymatoidea

                  Dioctophymatidae

 

            Hystrichis  Dujardin, 1845

    Synonyms:
      

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Morphology and Anatomy:

• Pharynx long without bulbs
• Nerve ring at posterior end of pharynx
• Pores and papillae distributed irregularly in posterior of body

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Distribution:

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Feeding:

Parasites of birds, especially those feeding on organsims in water. Common hosts for various species of Hystrichis are ibises, swans and crows.

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Biology and Ecology:

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Life Cycle:

Eggs are laid in early stages of development. They develop in water or moist soil.

The first juvenile stage is completed in the egg and can remain viable in the egg for more than 5 years (at cold temperatures).

When eggs are consumed by an oligochaete, the J1 emerges; it is equipped with a stylet similar to those of dorylaims and mermithids, but intestine not yet formed.

The J2 is found in the oligochaete blood vessels and body cavity. The J3 is the infective stage for the next host. Definitive hosts can be infected by direct feediong on oligochates or by feeding on paratenic hosts (like fish)  that have fed on oligochaetes.

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Ecosystem Functions and Services:

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Management:

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References:

Dujardin, F. 1845. Histoire naturelle des helminthes di vers intestinaux. Libraire Encyclopedique de Roret, Paris.

Copyright © 1999 by Howard Ferris.
Revised: December 09, 2024.