Belongs within: Dorylaimia.
The Dorylaimina are nematodes bearing an esophagus that is swollen and muscular posteriorly, and a simple hollow stylet.
<==Dorylaimina
|--DorylaimellusFB90 [BelondiridaeLB02, Belondiroidea]
|--Tylencholaimoidea [Leptonchoidea]LB02
| | i. s.: TylencholaimellusFB90
| |--LeptonchusMM02 [LeptonchidaeLB02]
| |--TylencholaimidaeMM02
| |--AulolaimoididaeLB02
| `--MydonomidaeLB02
`--Dorylaimoidea [Actinolaimoidea]LB02
| i. s.: CarcharolaimusFB90
|--AporcelaimusMM02 [AporcelaimidaeLB02]
|--QudsianematidaeLB02
|--NordiidaeLB02
|--ActinolaimusWh02 [ActinolaimidaeLB02]
| `--A. hintoniWh02
|--DorylaimidaeLB02
| |--DorylaimusD01
| | |--D. keiliniWh02
| | `--D. stagnalisD01
| `--MesodorylaimusWI89
`--LongidoridaeLB02
|--ParalongidorusWy02
|--LongidorusFB90
| |--L. caespiticolaWy02
| |--L. elongatusWy02
| `--L. leptocephalusWy02
`--XiphinemaWy02
|--X. americanumLB02
|--X. diversicaudatumWy02
|--X. indexWy02
|--X. pinoidesJ02
|--X. rivesiMG06
`--X. theresiaeJ02
*Type species of generic name indicated
References
[D01] Daday, E. 1901. Édesvizi mikroszkópi állatok [Mikroskopische Süsswasserthiere]. In: Horváth, G. (ed.) Zichy Jenő Gróf Harmadik Ázsiai Utazása [Dritte Asiatische Forschungsreise des Grafen Eugen Zichy] vol. 2. Zichy Jenő Gróf Harmadik Ázsiai Utazásának Állattani Eredményei [Zoologische Ergebnisse der Dritten Asiatischen Forschungsreise des Grafen Eugen Zichy] pp. 375–470. Victor Hornyánszky: Budapest, and Karl W. Hierseman: Leipzig.
[FB90] Freckman, D. W., & J. G. Baldwin. 1990. Nematoda. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 155–200. John Wiley & Sones: New York.
[J02] Justine, J.-L. 2002. Male and female gametes and fertilisation. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 73–119. Taylor & Francis: Florence (Kentucky).
[LB02] Ley, P. de, & M. Blaxter. 2002. Systematic position and phylogeny. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 1–30. Taylor & Francis: Florence (Kentucky).
[MG06] Mallatt, J., & G. Giribet. 2006. Further use of nearly complete 28S and 18S rRNA genes to classify Ecdysozoa: 37 more arthropods and a kinorhynch. Molecular Phylogenetics and Evolution 40: 772–794.
[MM02] Munn, E. A., & P. D. Munn. 2002. Feeding and digestion. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 211–232. Taylor & Francis: Florence (Kentucky).
[WI89] Walter, D. E., & E. K. Ikonen. 1989. Species, guilds, and functional groups: taxonomy and behavior in nematophagous arthropods. Journal of Nematology 21 (3): 315–327.
[Wh02] Wharton, D. A. 2002. Nematode survival strategies. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 389–411. Taylor & Francis: Florence (Kentucky).
[Wy02] Wyss, U. 2002. Feeding behaviour of plant-parasitic nematodes. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 233–259. Taylor & Francis: Florence (Kentucky).