Viscosia viscosa		Contents		Rev: 05/31/2025
		Classification		Hosts
		Morphology and Anatomy		Life Cycle
Return to Viscosia Menu		Economic Importance		Damage
		Distribution		Management
Return to Oncholaimidae Menu		Feeding		References
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Classification:

Enoplea

     Enoplia

        Enoplida

              Oncholaimoidea

                    Oncholaimidae

         Oncholaimellinae

Viscosia viscosa (Bastian 1865) de Man 1890

    Synonyms:

Mononcholaimus elegans (sensu Schuurmans-Stekhoven, 1942, 1950) (nec Kreis, 1924)

Mononcholaimus viscosus Allgen, 1930

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Morphology and Anatomy:

General characteristics: body slender, tapering slightly anteriorly cuticle smooth with scattered setae Lips with 6 inner labial papillae, 6 outer labial seeae and 4 cephalic setae amphids cup-shaped buccal cavity with sclerotized walls, small dorsal tooth, large right ventrosublateral tooth, smaller left ventrosublateral tooth Pharynx cylindrical with valve anteriorly nerve ring in centarl region of phsarynx, ventral pore slightly behind it; cardia prominent tail conoid, becomin cylindrical, curved ventrallyCaudal glands present Males: diorchic, testes opposed, outstretched spicules curved, distally forked gubernaculum absent caudal glands present tail with setae Females: didelphic, amphidelphic, ovaries reflexed Typical Demanian system tail without setae Ref: Smol and Sharma, 1984

A: Female total body; B: Male head; C: Female head; D Male pharynx and ventral gland; E: Male tail and caudal glands; F: Female head; G: Male spicules; H: Male full body; L: Sperm calls Drawings from Smol and Sharma, 1984

• body slender, tapering slightly anteriorly
• cuticle smooth with scattered setae
• Lips with 6 inner labial papillae, 6 outer labial seeae and 4 cephalic setae
• amphids cup-shaped
• buccal cavity with sclerotized walls, small dorsal tooth, large right ventrosublateral tooth, smaller left ventrosublateral tooth
• Pharynx cylindrical with valve anteriorly
• nerve ring in centarl region of phsarynx, ventral pore slightly behind it; cardia prominent
• tail conoid, becomin cylindrical, curved ventrally
• Caudal glands present

Males:

• diorchic, testes opposed, outstretched
• spicules curved, distally forked
• gubernaculum absent
• tail with setae

Females:

• didelphic, amphidelphic, ovaries reflexed
• Typical Demanian system
• tail without setae

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Distribution:

Described from fine sandy sediment in a brackish-water pool in northwestern Belgium.

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Economic Importance:

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Feeding:

Probably epistrate ingesting, feeding on microbial organisms

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Hosts:

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Life Cycle:

Ecophysiological Parameters:

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Damage:

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Management:

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References:

Gagarin, V.G., Nguyen, T.T. 2008. Free-Living Nematodes from the Red River Delta, Vietnam.  Biologiya Vnutrennikh Vol 1:1-17.

Smol, N. and Sharma, J. 1984. Two new and three redescribed species of Viscosia (Nematoda, Oncholaimidae. Hydrobiologia 114:123-147.

Copyright © 1999 by Howard Ferris.
Revised: May 31, 2025.