Rev 06/12/2023


          Telotylenchinae (Siddiqi, 1960)

Morphology and Anatomy:

Morphological and morphometrics studies of  the subfamily Telotylenchinae have been problematic because there is an almost continuous range of features within populations of the same species, as well as amongst species  (Scheck, 2023). Azizi et al (2022) concluded that analyses based on the relatively conserved 18S rDNA gene underlined the polyphyletic status of Tylenchorhynchus sensu lato. They determined  that three clusters representing Tylenchorhynchus, Bitylenchus and Sauertylenchus were well separated, and interspersed by representatives of the Macrotrophurinae. Analysis of the more variable D2-D3 28S rDNA sequences suggested at least four clades within the subfamily Telotylenchinae: two clades dominated by Tylenchorhynchus species; a third clade with representatives of Sauertylenchus, Bitylenchus, and Paratrophurus in distinct but unresolved branches; and a fourth clade dominated by Trophurus species.

They concluded that both Bitylenchus and Sauertylenchus should be seen as valid Telotylenchinae genera related to, but distinct from Tylenchorhynchus.


Azizi, K., Eskandari, A., Karegar, A., Ghaderi, R., Elsen, S.V.D., Holterman, M. and Helder, J., 2022. Analyses of morphological and molecular characteristics of Telotylenchinae from Iran point at the validity of the genera Bitylenchus and Sauertylenchus. Zootaxa, 5169(5), pp.425-446.

Fortuner & Luc, Rev. Nematol. 10(2):183-202 (1987).

Geraert, E. 2011.  The Dolichodoridae of the World.  Academia Press, Gent Belgium. 520p.

Scheck, H.J. 2023. California Pest Rating Proposal for Bitylenchus maximus (Allen, 1955) Siddiqi, 1986 Stunt nematode. California Department of Food and Agriculture, Sacramento.

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