Genus Tylenchocriconema
Raski & Siddiqi, 1975
Diagnosis
Tylenchocriconematinae. With characters of the family.
Lateral field slightly raised, with four incisures; three ridges see in
SEM. Female: Cephalic region very low, truncate, with
squarish oral plate, an I-shaped oral aperture flanked by two lateral liplets
and four small submedian lobes or pseudolips at corners of oral plate;
amphidial apertures in the form of dorsal-ventral slits at base of lateral
liplets; framework weak, vestibulum extension appearing as slender dark
rods. Stylet of female about 20 -30 um long, knobs rounded.
Orifice of dorsal gland 5 -6 um behind stylet base. Excretory pore
near basal bulb. Deirids absent. Vulva slightly overhung
by anterior lip flap and with small lateral membranes, well marked
by a sudden narrowing of body contour behind it, at 78 - 81% of body length.
Vagina, cuticularized, directed inward and forward. Postvulval uterine
sac absent. Spermatheca thin-walled, oval, offset, with minute, round
sperm. Female tail straight, elongate (over five anal body widths
long), subcylindroid to conoid-pointed tip. Male: 0.42
- 0.65 mm long, shorter and more slender than female. Lateral field
with four incisures. Head end asymmetrical, with ventrally directed
cephalic region bearing four submedian lobes; framework indistinct.
Oesophagus degenerate, stylet absent. Testis outstretched. Cloacal
lips forming a penial tube. Tail elongate-conoid, arcuate ventrally;
bursa
enclosing tail tip, with crenate margins. Spicules arcuate, cephalated,
pointed. Gubernaculum small, fixed. Juveniles similar to female
in body shape, cephalic region, stylet and oesophagus; tail evenly tapering
to an acute tip.
Type species
Tylenchocriconema alleni Raski & Siddiqui, 1975
No other species.
(Description- Siddiqi, 2000)
This
genus included in the Criconematid Project
DNA Sequences Obtained
specimen:
collected:
