Rev 06/05/2023

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Sectonema Thorne, 1930

Type species of the genus: Sectonema ventrale Thorne, 1930


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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. 

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


Body size range for the species of this genus in the database - Click:
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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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Alvarez-Ortega, S., Thi Anh Duong Nguyen, Joaqu�n 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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Copyright © 1999 by Howard Ferris.
Revised: June 05, 2023.