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Three morphological types of the genus Metagonimus encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River
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Korean J Parasito > Volume 29(3):1991 > Article

Original Article
Korean J Parasitol. 1991 Sep;29(3):217-225. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1991.29.3.217
Copyright © 1991 by The Korean Society for Parasitology
Three morphological types of the genus Metagonimus encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River
J Y Chai,W M Sohn,*M H Kim,**S T Hong and S H Lee
Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-460, Korea.
Abstract

Three morphological types of the genus Metagonimus were found encysted in the dace, Tribolodon taczanowskii, caught from the Sumjin River, Korea. They include Metagonimus Yokogawa type (M. yokogawai), Miyata type, and Koga type according to Saito's classification.

The metacercariae were experimentally fed to rats and hamsters and a total of 1,624 Metagonimus worms were recovered from their small intestine. The number of each type was 820 for Yokogawa type, 688 for Miyata type, 46 for Koga type, and 70 undetermined. The major differential keys between Yokogawa and Miyata types were in the position of two testes, distribution of uterine tubules, and size of the eggs, and the keys between Miyata and Koga types were in the position of two testes, distribution of vitelline follicles, and size of the eggs. The validity of Miyata type as a specific level should be retained until more convincing evidences are obtained. Koga type is regarded as a synonym of M. takahashii.

The present results reveal that there are 3 morphological types of Metagonimus whose larvae are encysted in the dace, T. taczanowskii, from the Sumjin River.

Figures


Figs. 1-2
Fig. 1. The dace, Tribolodon taczanowhkii, caught from the Sumjin river, the second intermediate host 3 morphological types of Metagonimus.

Fig. 2. Two metacercariae of Metagonimus encysted on the scale of T. taczanowskii.



Figs. 3-4
Fig. 3. An adult specimen of Metagonimus yokogawai recovered from a rat, 14 days after experimental infection. Note the two adjacent testes(T), and distribution of uterine tubules and vitelline follicles(VF). Oral sucker(OS), ventral sucker(VS), ovary(OV), seminal vesicle(SV) and seminal receptacle(SR). Fresh proparation.

Fig. 4. An adult specimen of Metagonimus Miyata type recovered from a rat, 14 days after experimental infection. Note the two separated testes (arrows) and uterine tubule passing through the intertesticular junction. Also note the limited distribution of vitelline follicles near the posteriormost portion of the body. Fresh preparation.

Fig. 5. An adult specimen of Metagonimus Koga type (=M. takahashii) recovered from a rat, 14 days after experimental infection. Note the two separated tested (large arrows) and uterine tubule passing through the intertesticular junction. A peculiar feature of this type was extensive distribution of vitelline follicles even through the post-testicular (right) portion (small arrows). Fresh preparation.

Fig. 6. A young adult specimen of M. yokogawai recovered from a hamster, 7 days after experimental infection. Note the arrangement of two testes and distribution of vitellaria. Acetocarmine-stained.

Fig. 7. An adult specimen of Metagonimus Miyata type recovered from a hamster, 8 days after experimental infection. Note the separated testes, and vitellaria, Acetocarmine-stained.

Fig. 8. An adult specimen of Metagonimus Koga type (=M. takahashii) recovered from a hamster, 8 days after experimental infection. Note the arrangement of two testes, and distribution of uterine tubules and vitellaria. Acetocarmine-stained.


Tables


Table 1
Distribution of Metagonimus metacercariae by body portions of T. taczanowskii.


Table 2
Results of worm recovery* (Metagonimus) from experimental rats and hamsters

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