Belongs within: Dorylaimia.
The Mononchida are a group of mostly soil-dwelling (rarely freshwater) predatory nematodes. The stoma is wide in members of the Mononchina but narrow in the Bathyodontina (Freckman & Baldwin 1990).
Characters (Ahmad & Jairajpuri 2010): Medium to large nematodes, generally well over 1 mm long. Lip region expanded, lips and labial papillae well expanded. Buccal cavity spacious, strongly sclerotised, posterior quarter or entire length embedded in pharyngeal tissue, provided with tooth or teeth, with or without ventral longitudinal ridges. Subventral walls either smooth or provided with large teeth or small denticles arranged in longitudinal ridges or scattered irregularly. Amphids small, goblet-shaped, aperture post-labial. Pharynx long, cylindrical, strongly muscular, with greatly thickened lumen. Pharyngo-intestinal junction tuberculate or non-tuberculate. Pharyngeal glands uninucleate; one dorsal and two pairs of subventrals, their orifices located posterior to nerve ring. Excretory system, when visible, with an ampulla and a pair of excretory ducts each terminating in a large uninucleate cell, the renette. Female genital system amphidelphic, mono-prodelphic or mono-opisthodelphic, with or without vulval papillae. Males lacking adanal pair of supplements but with a series of ventromedian papillae. Spicules paired and identical, gubernaculum and lateral accessory pieces present. Caudal glands three, uninucleate. Spinneret terminal or subterminal.
<==Mononchida
| i. s: Prionchulus punctatusH02, SW91
|--BathyodontinaLB02
| |--Mononchulidae [Mononchuloidea]LB02
| `--Cryptonchoidea [Bathyodontoidea]LB02
| | i. s.: OionchusFB90
| |--BathyodontidaeLB02
| `--CryptonchidaeLB02
`--MononchinaLB02
|--Anatonchidae [Anatonchoidea]LB02
`--MononchoideaLB02
|--Mononchus Bastian 1865E86 [MononchidaeLB02]
| `--M. italicus Andrassy 1959E86
`--Mylonchulus Cobb 1916E86 [MylonchulidaeLB02]
|--M. arenicolusKH02
|--M. cavensis (Schneider 1940) [=Mononchus cavensis]E86
|--M. nainitalensisJ02
`--M. subterraneus (Schneider 1940) [=Mononchus subterraneus]E86
*Type species of generic name indicated
References
[E86] Eder, R. 1986. Nematoda from continental subterranean aquatic habitats. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 125–132. E. J. Brill/Dr W. Backhuys: Leiden.
[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.
[H02] Hope, I. A. 2002. Embryology, developmental biology and the genome. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 121–145. Taylor & Francis: Florence (Kentucky).
[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).
[KH02] Kerry, B. R., & W. M. Hominick. 2002. Biological control. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 483–509. 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).
[SW91] Sayre, R. M., & D. E. Walter. 1991. Factors affecting the efficacy of natural enemies of nematodes. Annual Review of Phytopathology 29: 149–166.