Sectonema

Sectonema	Contents	Rev 06/05/2023
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Sectonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Aporcelaimidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Enoplea

Dorylaimia
Dorylaimida

Aporcelaimidae

Sectonematinae

Sectonema Thorne, 1930

Type species of the genus: Sectonema ventrale Thorne, 1930

Morphology and Anatomy:

The genus Sectonema, among other features, is recognized by the lip region being offset by a deep constriction and the protrusible toothe either a reduced odontostyle or a mural tooth.

Large to very large nematodes, 2-10 mm
Cuticle 3-layered with fine striations and criss-cross lines.
Labial region usually strongly offset from body contour, lips separated.
Amphid fooveae cup to stirrup-shaped, openingat head constriction and almost half lip-region diameter.
Odontostyle protrusible or a straight mural tooth on ventral wall of stoma. The mural tooth is attached to an odontophore almost 4x its length.
Enlarged portion of esophagus occupies almost 70% of total esophagus length.
Esophagus and intestine separated by a disc.
Female gonad didelphic amphidelphic; vulva a transverse slit with sclerotized inner lips. Pars refringens vaginae with two drop-shaped sclerotized pieces.
Male spicules strong, swollen, dorylaimoid; Ventromedian supplements 1-11, widely spaced..
Tail similar in both sexes, short conoid, conoid-rounded or hemispherical.

Ref. Andrassy, 2009; Pena-Santiago and Alvarez-Ortega, 2014; Alvarez-Ortega et al., 2016, Alvarez-Ortega and Pena-Santiago, 2019.

Female:

Males:

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

Categorized as predators and omnivores by Yeates et al., 2009.

Observed to feed on oligochaetes (Thorne, 1930).
When the nematode attacks its prey, the tooth is thrust into the body of the victim. The body wall is cut by a dorsal to ventral slash of the tooth (Thorne, 1930).

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Biology and Ecology:

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

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Management:

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References:

Alvarez-Ortega, S., Thi Anh Duong Nguyen, Joaquï¿½n Abolafia, Thi Thanh Tam Vu, Michael Bonkowski and Reyes Pena-Santiago 2016. Three new species of Sectonema Thorne, 1930 (Dorylaimida: Aporcelaimidae) from Vietnam. Nematology 18:517-536.

Alvarez-Ortega, S., Pena-Santiago, R. 2019. Morphology, phylogeny and taxonomy of the genus Sectonema(Nematoda, Aporcelaimidae). Zoologica Scripta 48:535-544.

Andrassy, I. 2009. Free-living Nematodes of Hungary III. Hungarian Natural History Museum, Budapest. 608p.

Pena-Santiago, R. and Alvarez-Ortega, S. 2014. Studies on the genus Sectonmea Thorne, 1930 (Dorylaimida: Aporcelaimidae. Redescription of S. ventrale Thorne, 1930, the type species of the genus. Nematology 14:1097-1104.

Thorne, G. 1930. Predacious nemas of the genus Nygolaimus and a new genus, Sectonema. Journal of Agricultural Reaearch 41:445-466.

Yeates, G.W., T. Bongers, R. G. M. De Goede, D. W. Freckman, and S. S. Georgieva. 1993. Feeding habits in soil nematode families and genera—An outline for soil ecologists. Journal of Nematology 25:315-331

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Sectonema

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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Feeding:

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Biology and Ecology:

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Life Cycle:

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Ecosystem Functions and Services:

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Management:

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References:

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Copyright © 1999 by Howard Ferris.
Revised: June 05, 2023.

Sectonema

Copyright © 1999 by Howard Ferris. Revised: June 05, 2023.

Copyright © 1999 by Howard Ferris.
Revised: June 05, 2023.