Fróðskaparrit - 31.12.2000, Side 179

SNIKAR A SEYðl IFØROYUM
183
Fig. 4. Seasonal variation in epgfor Strongyle type
eggs, Nematodirus battus and other Nematodirus spp.
Mynd 4. Broytingar í epg gjøgnum árið. Nematodirus
battus, aðrir Nematođirus og Strongylidur.
Trichuris ow's
Fig. 5. Seasonal variation in epgfor Trichuris ovis.
Mynd 5. Broytingar í epg gjøgnum árið. Trichuris
ovis.
Muellerius capillaris and Dictyocaulus filaria

m S
\ / \
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S <?n% —•—MueHehus —•— Dictyocaulus
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i
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lamb. lamb. lamb, ewe, ewe, evve, autumn winter spring autumn winter spring
Fig. 6. Seasonal variation in proportion ofsheep in-
fected by Muellerius capillaris and Dictyocaulus
filaria.
Mynd 6. Broytingar í lutfalli av seyði fongdur við
Muellerius capillaris og Dictyocaulus filaria eftir
árstíð.
Fig. 7. Seasonal variation in oocysts pr. gramfaeces
for Eimeria spp.
Mynd 7. Broytingar í opg gjøgnum árið. Eimeria spp.
Identification
Identification was made by microscopic ex-
amination, using identification and classifi-
cation methods described in, e.g., Gibbons
and Khalil, 1982; Lichtenfels and Pilitt,
1983; Hoberg et al., 1985; 1986; Urquhart
etal., 1987; Lichtenfels and Hoberg, 1993;
Hansen and Perry, 1994; Kassai, 1999.
Teladorsagia spp.
The adults are reddish-brown slender
worms, occurring on the surface of the abo-
masal mucosa. The length is 0.6-1 cm. Fe-
males are longer than males. The larval
stages occur in the gastric glands. The fe-
males of this genus are characterised by
having annular rings at the tip of the tail,
and have a small or no vulval flap. Both
sexes have small papillae on each side of
the cervix. Teladorsagia is characterised
by a copulatory bursa in which the five lat-
eral rays are arranged 2—2—1. The eggs
are of the strongyle type. The Teladorsagia
spp. are T. circumcincta, T. trifurcata, and
T. davtiani. However, the two last types
might be morphological variations of T. cir-
cumcincta (Lancaster and Hong, 1981;
Stevenson et al., 1996). The eggs are of the
strongyle type.
T. circumcincta: The male is identifíed
by the spicules. They are slender and rela-
tively long, and are divided in the distal
fourth. The dorsal and ventral branches are
more than half as long as the main branch.
(Fig. 8).
T. trifurcata and T. davtiani: These are
difficult to separate morphologically. Spi-
cules are relatively stout and divided at the
beginning of the distal third. Their dorsal