Udonchus tenuicaudatus

Udonchus tenuicaudatus	Contents	Rev: 10/16/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Udonchus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Rhabdolaimidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Plectida: Leptolaimoidea; Rhabdolaimidae
Monochromadorinae

Udonchus tenuicaudatus Cobb, 1913

Type species of the genus

Synonyms:

Morphology and Anatomy:

Female:

Body medium-sized, 0.4-0.5 mm, slender, tapering at both extremities.
Cuticle thin, smooth, without longitudinal lines and somatic setae; lateral field inconspicuous.
Lip region rounded, truncate to flattened, continuous with body contour; lips fused; labial and cephalic sensilla inconspicuous.
Amphidial apertures transverse oval slits, located at middle to posterior level of stoma,
Stoma narrow, tubular, slightly expanded anteriorly, about 1.1- 1.2 lip diameter long. Cheilostom modified into 12 fine rugae, rest of stoma moderately cuticularized. Dorsal stegostomal wall with a small, pointed, anteriorly-directed denticle, subventral walls bearing two subventral denticles- at level of dorsal denticle and at 2/3rd level of stoma.
Pharyngeal tissue encircling entire stoma, forming a prominent buccal capsule.
Pharynx with long, slender corpus terminating in a rounded, pyriform to triangular basal bulb.
Nerve ring located at 49-67% of pharyngeal length. Secretory-excretory pore usually inconspicuous.
Cardia of well developed, rounded to elongated glandular cells,
Rectum thin-walled, 0.8-1.2 abd long, often with an associated cell at its distal wall.
Mono-prodelphic. Ovary antidromously reflexed laterally, on right side of intestine;
Vulva a transverse slit, located at 220-286 um from anterior end without protruded lips. Post-uterine sac absent;
Vulva-anus distance 71-109 um
Tail elongate, gradually tapering towards terminus, straight or slightly curved ventrally. Caudal glands usually inconspicuous.

Male:

Very rare

Ref: Tahseen et al., 2012

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Usually in aquatic habitats. The species has been reported from India, Asia (Sumatra), Africa (Ethiopia, Zambezi river, Lake Tanganyika), Europe (Germany, Austria, Hungary, Spain, Russia), Central America (Jamaica) and South America (Colombia). (Tahseen et al., 2012).

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Feeding:

Free-living bacterial-feeding or algivore nematodes

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Biology and Ecology :

Inhabits a variety of soils and freshwater systems.

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Life Cycle:

Males are extremely; parthenogenetic mode of reproduction may be a favorable adaptation for an aquatic environment (Tahseen et al., 2012)

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

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Ecosystem Functions and Services :

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Management:

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References:

Andrassy, I. 2005. Free-living Nematodes of Hungary, I (Nematoda errantia). Pedozoologica Hungarica 3. Hungarian Natural History Museum, Budapest, Hungary. 518p.

Cobb, N. A. 1913. New nematode genera found inhabiting freshwater and non-brackish soils. Journal of the Washington Academy of Sciences 3:432-444.

Holovachov, O. & Bostrom, S. (2004): Morphology and systematics of the superfamilies Leptolaimoidea Oerley, 1880 and Camacolaimoidea Micoletzky, 1924 (Nematoda: Plectida). Journal of Nematode Morphology and Systematics, 7: 1-49.

Ocana, A. 1991. A redesctiption of two nematode species found in hot springs. Nematol. Medit. 19:173-175.

Tahseen, Q., Sultana, R., Khan, R., Hussain, R. 2012. A New Genus and Species of the Family Rhabdolaimidae (Nematoda), with Descriptions of Two Known species and Taxonomic Discussion. J. Nemsatology 44:302-312.