(De Coninck, 1935) Loof & Coomans, 1986
|Dorylaimus parafecundus De Coninck,
Paradorylaimus parafecundus (De Coninck, 1935)
Drepanodorylaimus parafecundus (De Coninck, 1935)
Jairajpuri & Ahmad, 1992
Redescription of Paradorylaimus parafecundus
This species was described originally from two male, four females and
thirteen juveniles. The type material comprises two males, three
females and 29 juveniles (plus some juveniles probably not belonging to
this species). Of one juvenile the stage is uncertain. Dimensions
see Table 1.
Body outstretched in the female, posterior end curved
ventrad strongly in the male. Thickness of cuticle 4 um,
increasing to 9 um on base of female tail. Cuticle without
longitudinal ridges, but with very fine transverse striae. Lateral
chord one-fifth to one-sixth of body width. Amphidial apertures 8
or about one-half of corresponding body width. Lip region truncate,
offset by a shallow constriction, the papillae giving it an angular outline.
Whereas usually in dorylaims the sensillae are arranged into an anterior
circle of 6 and a posterior one of 10, this species shows the reverse:
an anterior circle of 10 and a posterior one of 6. The odontostyle
has deteriorated and partly dissolved in all specimens, especially in the
adults, so that the most reliable lengths are those of the spare odontostyles
lf the preceding stages. The adult odontostyle is much shorter than
indicated in the original description (41- 46 um vs. 60 - 65 um).
As all specimens have the odontostyle protruded, the characters of the
guiding ring are uncertain. Cardia elongate- triangular.
Pharyngeal characters (two males, two females):
The pharynx begins to widen at 44 - 50% and attains its full width
at 48 - 55% of its length from head end. DO lies slightly anterior
to the latter level, the distance DO - DN is 17 - 18 um. The S1N
lie rather far apart, the anterior one is smaller. DN measures 11-12
x 7-10 um, nucleolus 4 - 6 um; S1N1
4-5 x 3 um, nucleolus 1.5 um; S1N2
10 x 6-9 um, nucleolus 4 um; S2N 8x8
nucleolus 4 um. Pharyngeal characters (DO, DN,etc.) are according
to Loof & Coomans (1970). Locations:
|DO 47 - 52%;
||S1N1 63 - 66% (n = 2);
|DN 50 - 54%;
||S1N2 72 - 74%;
|DO - DN 2.4 - 2.6%;
||dist. 7.7 - 9.3%;
|S2N 82 - 85%;
||K = 59 - 61 (n = 2)
|S2O 82- 86%;
||K' = 62 - 66.
One female has a distinct endolid (cf. Siddiqi, 1971) 160 um
from head end.
Female. Vulva longitudinal, vagina
heavily cuticularized. Uteri crowded with sperm. No eggs.
Prerectum 85 - 110 um long = 1.3 -1.7 x length of rectum or 1.9
- 2.5 anal body widths. Tail filiform, tapering to very fine terminus.
Male. Length of prerectum 110 - 123
it joins the intestine proper at 81 - 123 um posterior to the anteriormost
supplement. Ventromedian supplements contiguous, their number 16
-17, the posteriormost one lying about 100 um anterior to the cloacal
aperture. Spicule length 98 - 100 um (along axis). Tail
short, rounded, with pores as illustrated. About twelve pairs of
(Description- Loof & Coomans, 1986)
Specimens from Costa Rica