Description- Female: Body slender (maximum width usually 12-13
straight to arcuate. Annules fine but distinct, 0.8-0.9
wide at mid-body. Lateral fields 1/10 to 1/12 body-width, originating
26-30 um behind spear base as a narrow streak and ending on tail
a little anterior to its middle, with two crenate incisures. Cephalic
region continuous, rounded, low, circular in cross-section, 4.5-5
wide and 2 um high, with four to five fine transverse striae; sclerotization
light; amphids close to oral opening, indistinct in lateral view.
Spear slender, 6-7 um long; conus tiny, about 2 um long;
basal knobs minute, rounded, 1.3 um across. Orifice of dorsal
oesophageal gland close to spear base. Oesophagus 103-125 (113) um
long. Precorpus slender, slightly enlarging at base to a spindle-shaped
non-muscular, non-valvate postcorpus; width of precorpus and postcorpus
about 1.7 um and 3 um respectively. Isthmus enlarges
behind nerve ring very gradually so that anterior end of basal bulb is
not demarcated. Basal bulb elongated, sac-like, 5.5-6.5 um
at its widest, with flat to rounded base having a rounded to discoidal
cardia. Nucleus of dorsal oesophageal gland 6-11 um anterior
to oesophageal base. Nerve ring about one corresponding body width
behind postcorpus. Excretory pore 75-85 (80) um from anterior end,
less than a body width behind nerve ring; excretory duct prominent, sclerotized.
Deirids 8-11 um behind level of excretory pore, on a slightly
expanded area of lateral field. Hemizonid distinct, four to five
annules long, zero to two annules anterior to excretory pore.
Vulva a depressed closed slit, without epiptygma and lateral flaps. Vagina curved, about 3/4 body-width long, its anterior two-thirds strongly cuticularized, refractive. Post-vulval uterine sac absent. Uterus with a glandular quadricolumellar and a muscular part. Spermatheca rounded, offset, with minute rounded sperm-like bodies. Ovary outstretched, with oocytes in one or two rows. Phasmids three to seven annules anterior to vulva. Body diameter at anus two-thirds of that at vulva. Rectum about one anal body width long; anus distinct. Tail straight to slightly arcuate, regularly tapering to terminus which is abruptly narrowed and sharply pointed, 89-122 (100) um long, finely annulated except at the terminus.
Male: Not known.
Type habitat and locality: Bush soil in Block F, International Institute of Tropical Agriculture, Oyo Road, Ibadan, Nigeria
Type material: Collected by Dr. F.E. Caveness in 1974. Holotype
female and 4 female paratypes at C.I.H., St. Albans, England; 2 female
paratypes at Nematology Department, Rothamsted Experimental Station, Harpenden,
England; 1 female paratype at each of these nematological centres:
Landbouwhogeschool, Wageningen, Holland; Instituut voor Dierkunde, Ghent,
Belgium; USDA Nematode Collection, Beltsville, Maryland, USA and Indian
Agricultural Research Institute, New Delhi, India.
(Description- Siddiqi, 1979)