Females (n = 21): L = 0.43 (0.35-0.49) mm; a = 35 (28-45); b
=
5.0 (4.7-5.3); c = 3.7 (3.0-5.3); c' = 15 ( 10-20); T/VA
= 2.0 (1.6-2.6); V = 58 (53-61); V' = 80 (78-82); MB = 39
(36-43); stylet = 6-7 um.
Males (n = 2); L = 0.35-0.50 mm; a = 31-42; b =
5.5-5.7; c = 3.5-4.3; MB = 36-45; stylet = 6 um; spicules
= 12-14um; gubernaculum = 3 um.
Annules rounded, the widest annules measured were
1.2 um, in most specimens these were 0.8-0.9 um, sometimes
annules were too small to be measured. Head annules very obscure.
Stylet knobs tend to be little less elongated than in other Ottolenchus
species. Median bulb elongated ovate, posterior bulb elongated.
Length of oesophagus 86 um (70-95)
Vagina less than half of body width. Spermatheca
a rounded, small pouch. Uterus unusually spacious, posterior
uterine sac usually as long as the body width. Number of annules
between vulva and anus could be counted in seven females only, and varied
from 47-57. Tail long,
conical, needle like at the end. Tail length 119 um (94-163).
Annulation invisible on posterior part of tail.
Male with a small crenate bursa.
The above description is based on paratypes, six
collections from various localities in Poland, and one collection from
Thalwil, Switzerland.
O. helenae differs from the other species
of the genus by a delicate cuticular annulation, longer tail and spacious
uterus with relatively long posterior uterine sac.
(Description- Brzeski, 1982)
