Khan, E. and Singh, D.B. (1974)
5 ?? (Paratypes): L = 0.45 mm (0.42-0.47); a = 24.0 (22.8-25.2);
b = 4.4 (3.6-4.8); c = 18.0 (11.5-29.0); V = 66 (66-72); Spear = 15 u
(15-17). Female (Holotype): L = 0.44 mm; a = 24.4;
b = 3.6; c = 20.0; V = 68; Spear = 17 u.
2?? (Ferozpur): L = 0.35 mm (0.32-0.38); a = 20.7 (20.3-21.2);
b = 4.2 (4.2-4.3); c = 16.9 (13.6-20.3); V = 72 (71-74); Spear = 15 u
When killed, nematode assumes only a slightly ventrally arcuate
shape on death. Body striation fine, lip-region low conoid with two
annules having comparatively large first annule. Cephalic sclerotization
strong extending up to three body annules. Spear 15 u in length
(15-17 u in paratypes), spear knobs flattened rounded. Opening
of dorsal oesophageal gland located 2 u posterior to spear-knob.
Oesophagus typical of the genus. Excretory pore located opposite
oesophago-intestinal junction. Hemizonid anteriorly adjacent to excretory
pore. Lateral field with four incisures. Ovary single, anteriorly
outstretched, Spermatheca inconspicuous without sperms. Post uterine
sac 1½ times the vulval-body-widths long. Occasionally rudimentary
posterior ovary present. Tail conoid bearing 28 (20-35 in paratypes)
annules on the ventral side, terminus indented. Phasmid located in
the posterior third of tail.
Male: Not found.
Holotype: Female on Type Slide No. 554 deposited
with the National Nematode Collection, Division of Nematology, Indian Agricultural
Research Institute, New Dehli-12.
Paratypes: 5 females on Type Slide No. 552-555.
Other data same as for holotype.
Type habitat and locality: Soil around guava roots,
at Burwala, Dehli.
Diagnosis and relationship: Pratylenchus impar resembles
Pratylenchus alleni, Ferris, 1961 but can differentiated from the
later by having comparatively bigger first annule, anteriorly located vulva,
post uterine sac measuring 1½ times the vulval body width, inconspicuous
Spermatheca without sperms and also by the absence of male (V = 78-83,
post uterine sac slightly longer than vulval-body-width, Spermatheca with
sperms and males present in P. alleni).
Specimens collected from soil around the roots of sugarcane at
Ferozpur have been identified as P. impar.