Yagansiella longicollis		Contents		Rev: 12/25/2025
		Classification		Hosts
		Morphology and Anatomy		Life Cycle
Return to Yagansiella Menu		Economic Importance		Damage
		Distribution		Management
Return to Ungellidae Menu		Feeding		References
		Go to Nemaplex Main Menu		Go To Dictionary of Terminology

Classification:

Chromadorea
       Rhabditida
       Tylenchina
        Drilonematoidea

             Ungellidae

Ungellinae

Yagansiella longicollis Ivanova & Vaucher, 2005

Type species of the genus

    Synonyms:

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Morphology and Anatomy:

• Neck region very long and thin, body swollen.
•  Paired blade-like cephalic hooks, independently moveable
• Cuticular ridges posterior to mouth.
• Amphids elliptical.
• Oral aperture minute, no stoma; esophagus with corpus, isthmus and bulb. Nerve ring situated around isthmus. Excretory pore at isthmus level.
• Intestine thick-walled
• Large paired deep transversely oriented fimbriate organs in caudal region with prominent lip-like basal rim.
• Spacious pseudocoel.
• Male and female morphologically similar

	Female: Monodelphic-prodelphic, spermatheca set-off, distal tip of ovary near esophageal base, Vulva posterior (90%) with oblique vagina. Male: Monorchic; Spicules paired and curved; Gubernaculum thick with dorso-caudal apophysis and crurae, Bursa absent Ref: Ivanova and Vaucher, 2005
Yagansiella longicollis Female: A: entire body B: head C:: anterior, D:: posterior, E: spermatheca region. Scale bars in um Drawings from Ivanova and Vaucher, 2005

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Distribution:

Described from coelomic cavity of earthworm Yagansia spatulifera in Chile.

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Economic Importance:

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Feeding:

Parasites of the body cavity of earthworms.Yagansia spatulifera

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Life Cycle:

Direct life-cycle, earthworms the definitive and only host.

Ecophysiological Parameters:

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Damage:

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Management:

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References:

Copyright © 1999 by Howard Ferris.
Revised: December 25, 2025.