Trichotylenchus

Trichotylenchus	Contents	Rev 08/12/2025
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Classification:

Chromadorea Rhabditida Tylenchina Tylenchoidea
Telotylenchidae
Telotylenchinae

Trichotylenchus Whitehead, 1960

Type species of the genus: Trichotylenchus falciformis Whitehead, 1960

Synonyms:

Uliginotylenchus Siddiqi, 1971

Triversus Sher, 1973

Divittus Jairajpuri, 1984

Morasinema Javed, 1984

Note: The genus Uliginotylenchus Siddiqi, 1971 was erected to accommodate those species of Tylenchorhynchus with an areolated lateral field with three incisures. Fortuner and Luc (1987) and Maggenti et al. (1988) thought that these species should be in Trichotylenchus Whitehead, 1960. The main differences between Uliginotylenchus and Trichotylenchu were the different cephalic morphology and that in Trichotylenchus the esophageal glands may extend over the intestine.while in Uliginotylenchus they do not. Xu et al (2011) support the validity of Uliginotylenchus as a genus. While Xu et al placed the genus in the family Belonolaimidae, most current opinion would place it in the Dolichodoridae or Telotylenchidae.

Per Geraert, 2011, the genus Trichotylenchus is now generally used for all "Tylenchorhynchus-like" species with 3 lines in the lateral field and no longitudinal lines outside the lateral field.

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Morphology and Anatomy:

Body generally < 1mm, slender
Lip region continuous with body contour. In SEM face views, oral disc lemon-shaped, submedian lobes low and flattened, lateral lobes completely regressed.
Amphid apertures appear as slits or pores at lateral edge of labial disc.
Stylet attenuated, 15 to 25 µm long, with needle-like cone (somewhat stronger in T. palustris).
Lateral field often areolated, with three lines.
Deirids absent.
Pharyngeal glands in a bulb abutting intestine, or overlapping intestine
Tail long, three to six times as long as wide, cylindroid, with a broadly rounded or clavate end, sometimes with thicker cuticle at tail tip.
Female didelphic-amphidelphic, ovaries outstretched
Male present in all known species, spicules with well-developed velum; bent gubernaculum.
Bursa enveloping tail.

[Ref: Fortuner & Luc, (1987); Geraert, 2011]

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

Siddiqi, M.R. 1971. Structure of the oesophagus in the classification of the superfamily Tylenchoidesa (Nematoda). Indian J. Nematology 1:25-43.