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Korean J Parasitol > Volume 32(1):1994 > Article

Original Article
Korean J Parasitol. 1994 Mar;32(1):1-6. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1994.32.1.1
Copyright © 1994 by The Korean Society for Parasitology
Application of scanning electron microscopy in assessing the prevalence of some Setaria species in Korean cattle
J K Rhee,*E Y Choi,B K Park and B G Jang
Department of Parasitology, School of Veterinary Medicine, Chonbuk National University, Chonju 560-756, Korea.
Received December 23, 1993; Accepted February 09, 1994.

Abstract

The numbers of individual Setaria species in the peritoneal cavities of Korean cattle were estimated. The worms were tentatively identified under light microscopy, and then precisely classified by SEM on the basis of unique features at the anterior and posterior ends of the adult worms. The positive rate of Setaria species was 34.2% out of 1,074 Korean cattle surveyed; that of S. digitata was 25.1%, S. marshalli 2.9% and both species 6.2%, respectively. Out of a total of 1,254 worms collected, 66.8% were female and 19.1% were male S. digitata ; 9.2% were female and 5.0% were male S. marshalli , respectively. The average length of S. marshalli was somewhat longer than that of S. digitata. S. marshalli was documented for the first time in Korea.

Figures


Figs. 1-8
Light micrographs showing fresh specimens of Setaria spp. (Figs. 1-4 for the lateral view of the head. Figs. 5 and 7 for the lateral view of the posterior end. and Figs. 6 and 8 for the ventral view of the posterior end) Magnification on all id 400 times. Fig. 1. Female Setaria digitata. Fig. 2. Male S. digitata. Fig. 3. Female S. marshalli,Fig. 4. Male S. marshalli,Fig. 5. Female S. digitata. Fig. 6. A pair of the large lateral appendages is located at a long distance from the tail end of male S. digitata. Fig. 7. Female S. marshalli. Fig. 8. A pair of the small lateral appendages is visible at a short distance from the posterior end of male S. marshalli,Abbreviations: DP, dorsal projection; VP, ventral projection; LL, lateral lip


Figs. 9-14
Scanning electron micrographs showing different organs of Setaria spp. (Figs. 9-12 for the view en face of the heal) Fig. 9. Male Setaria digitata, bar = 10 µm. Fig. 10. Female S. digitata, bar = 10 µm. Fig. 11 Male S. marshalli, bar = 10µm. Fig. 12. Female S. marshalli, bar = 10µm. Fig. 13. The view en face of a deirid of female S. digitata, bar = 5µm. Fig. 14. The lateral appendage enlarged and the phasmidial pore (marked with arrow)are distinctly visible for female S. marshalli, bar = 5µm.


Figs. 15-20
Scanning electron micrographs showing different organs of Setaria spp. (Figs. 9-12 for the view en face of the heal) Fig. 15. The ventral view of the posterior end of male S. digitata, bar = 50µm. Fig. 16. The ventral view of the posterior end of male S. marshalli, bar = 50µm. Fig. 17. The tapering terminal end with a smooth knob for female S. digitata, bar = 10 µm. Fig. 18. The obtusely ending tail with the roughly furcated terminus for female S. marshalli, bar = 10µm. Fig. 19. the postdeirid, at th base of which cuticular vertical striations intermit, with the furcated needle-like formation for female S. digitata, bar = 5 µm. Fig. 20. The ventral bands of the tail of male S. marshalli, bar = 5 µm

Tables


Table 1
Comparison of the lenghts (n = 50) of Setaria spp. in relation to sex

References
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