Viscosia

Viscosia	Contents	Rev 06/15/2026
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	Morphology and Anatomy	Life Cycle
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Viscosia de Man, 1890

Type species of the genus: Viscosia viscosa (Bastian, 1865) de Man, 1890

Synonyms:

A large number of species has been described for Viscosia, many with incomplete detail in the descriptions (Smol and Sharma, 1984)

Cuticle smooth
Head flattened
Outer labial and cephalic sensillae are short setae
Stoma athick-walled cylinder, 2.0-2.2 times as long as it is wide with three teeth; of which the right subventral tooth is considerably larger than dorsal and left subventral.
Amphid apertures are 40-50% the body diameter and situtated at level of posterior half of stoma.
Esophagus muscular with cardia small, protruding into mid gut lumen.
Renette cell elongate-cylindrical, 30-35 um long, situated ventrally 90-120 um from posterior end of esophagus with the excretory pore located posterior to nerve ring.
Freshwater, brackish and marine nematodes.

Female:

Didelphic, amphidelphic
Demanian system present and simple, consisting of a prolongation of the ovary at the reflexed point that connects it with the intestine through the osmosium.

Male:

Ref: Gagarin and Nguyen, 2008; Smol et al., 2014

Viscosia timmi
Female (1, 6) and male (2, 5). 1, 2, body shape; 3, head; 4 anterior portion of body; 5, 6 tail region
from Gagarin and Nguyen, 2008

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

Free-living freshwater and marine nematodes.in bottom sediments.

For Ecophysiological Parameters for this genus, click

Coomans, A., Vincx, M., Decraemer, W. 1985. Nematodes from a fresh-water pool on a coral island in the Solomon Islands. Hydrobiologia 123:265-281.

Gagarin, V.G., Nguyen, T.T. 2008. Free-Living Nematodes from the Red River Delta, Vietnam. Biologiya Vnutrennikh Vol 1:12-17.

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

Smol, N., Muthumbi, A., Sharma, J. 2014. Order Enoplida, 7.3. In Schmidt-Rhaesa, A. (ed) Handbook of Zoology. De Gruyter, Berlin