Genus Gymnotylenchus
Siddiqi, 1961
Diagnosis
Gymnotylenchinae. Adults found inside roots: body
straight to ventrally arcuate when relaxed; 0.48-0.63 mm long; a = 34-43
in type species. Cuticle finely striated. Lateral field with
six incisures. Stylet moderately strong, small (8-11 um long in type
species); knobs distinctly rounded. Oesophagus cylindroid, with a
non-valvate swelling in region of orifices of subventral glands.
Orifice of dorsal oesophageal gland closely behind stylet base. Oesophago-intestinal
junction anterior to nerve ring. Oesophageal glands forming an
elongate diverticulum extending over intestine dorsally or subdorsally.
Excretory pore behind nerve ring. Vulva small, transversely oval,
pore-like, at 80-84% of body length in type species. Vagina directed
forward. A quadricolumella of 16 cells present. Spermatheca
not formed. Vulva-anus distance a little more than tail length in
type species. Intestine with distinct lumen thoughout. Rectum
and anus distinct. Female tail elongate-subcylindroid, with a rounded
smooth terminus. Entomoparasitic generation: Preadult,
impregnated infective females seen but not described by Siddiqi (1961).
Male tail similar to that of free-living female, but slightly directed
dorsally. Vas deferens packed with minute sperm numbering several
hundreds. Testis outstretched with tip sometimes reflexed, reaching
oesophagus, with spermatocytes in one or two rows. No trace of
bursa or gubernaculum. Spicules prominently cephalated, distally
pointed.
Type species
Gymnotylenchus zeae Siddiqi, 1961
Other species
Gymnotylenchus dendrophilus (Rühm, 1956)
Sumenkova, 1975
syn. Neotylenchus dendrophilus
Rühm, 1956
G. fusiformis Truskova & Eroshenko, 1977
(Description- Siddiqi, 2000)
DNA Sequences Obtained