Fróðskaparrit - 31.12.2000, Page 181

SNIKAR A SEYðl IFØROYUM
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Fig. 14. Nematodirus filicollis. Bursa.
a long, pointed tail. The eggs are brown,
the morula fills out the eggshell. and the
sides of the egg are parallel. (Fig. 13).
N. filicollis. The male has two sets of
parallel rays in each copulatory lobe, i.e.
the lateral rays are parallel. (Fig. 14). The
spicules are fused anterior to the tip. The
female has a truncate tail, with a small
spine. Eggs are ovoid and colourless. The
morula does not fill out the entire eggshell.
(Fig. 15).
Fig. 15. Nematodirus spp., egg.
Trichuris ovis
This nematode is found in the large intes-
tine. It is large (male 5-8 cm, female 3.5-7
cm), whip-like, with a long, thin anterior
part (0.1 mm), and a thick posterior end, (1
mm). The male tail is coiled with a single
spicule. (Fig. 16). The eggs are character-
istically lemon-shaped with a plug in each
end. (Fig. 17).
Chabertia ovina
This nematode is also found in the large in-
testine. The length is 15-20 mm. The
worms are markedly truncated at the anteri-
or end, due to a buccal capsule. There is a
double row of papillae around the rim of
the buccal capsule, but no teeth are present.
Fig. 13. Nematodirus battus. Egg.
is present. The anterior half of the worm is
distinctly thinner than the posterior. The
spicules are long and slender with fused
tips. The eggs are relatively large (150-230
pm).
Nematodirus battus. The male is distinct
from other Nematodirus spp. by the diver-
gent lateral rays of the copulatory bursa.
(Fig. 12). The tip of the spicules is bluntly
pointed and heart-shaped. The female has