Yagansiella

Yagansiella	Contents	Rev 12/25/2025
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Yagansiella Menu	Economic Importance	Damage
	Distribution	Management
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Classification:

Chromadorea Rhabditida Tylenchina Drilonematoidea
Ungellidae: Ungellinae

Yagansiella Ivanova & Vaucher, 2005

Type species of the genus: Yagansiella longicollis Ivanova & Vaucher, 2005

Synonyms:

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 Male: A: entire body B: head C:: anterior, D:: spicules and gubernaculum, E: tail.
Scale bars in um
Drawings from Ivanova and Vaucher, 2005

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

Distribution:

Type species described from coelomic cavity of earthworm Yagansia spatulifera in Chile.

Feeding:

Food Sources and Feeding strategies for the genus Yagansiella

Parasites of the coelomic cavities of terrestrial oligochaetes of the genus Yagansia (Ivanova and Vaucher, 2005)

Hosts:

Earthworms of genus Yangsia but actual host range unknown,

For an extensive host range list for this genus, click

Life Cycle:

Earthworms are probably the definitive and single hosts.

For Ecophysiological Parameters for this genus, click

Ivanova, E.S., Vaucher, C. 2005. New genera and species of nematode parasites (Drilonematoidea: Ungellidae) from coelomic cavity of Neotropic acanthodrilids deposited in the Natural History Museum of Geneva, Switzerland. Rev. Suisse de Zoologie 112:943-961

Yagansiella

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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Economic Importance:

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Feeding:

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Hosts:

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Life Cycle:

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Damage:

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Management:

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References:

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

Yagansiella

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

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