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Korean J Parasitol > Volume 36(1):1998 > Article

Original Article
Korean J Parasitol. 1998 Mar;36(1):1-6. English.
Published online Mar 20, 1998.  http://dx.doi.org/10.3347/kjp.1998.36.1.1
Copyright © 1998 by The Korean Society for Parasitology
Radix auricularia coreana: natural snail host of Clinostomum complanatum in Korea
D I Chung,*1H H Kong,1 and C Y Joo2
1Department of Parasitology, Kyungpook National University School of Medicine, Taegu 700-422, Korea.
2Department of Parasitology, Keimyung University School of Medicine, Taegu 700-712, Korea.

*Corresponding author (Email: dichung@bh.kyungpook.ac.kr)
Received December 04, 1997; Accepted January 31, 1998.


An epidemiological survey was carried out to determine the first intermediate host of Clinostomum complanatum among freshwater snails in Korea. Two species of snails belonging to the family Lymnaeidae were collected in Kaum-ji (pond), Uisong-gun, Kyongsangbuk-do. Twelve (0.9%) out of 1,273 Radix auricularia coreana examined were found to liberate cercariae of C. complanatum, which were identified by morphological characteristics and experimental infections in freshwater fish. Pseudorasbora parva. The cercariae were brevifurcate and clinostomatoid. They had a transparent dorsal fin, a well developed penetrating organ and a pair of eye spots. The body measured 119-147 × 33-36 µm, tail stem, 275-370 × 19-26 µm, and furcae, 72-104 µm. Rediae were demonstrated in the infected snail after crushing. Redia, 527-1,630 µm long and 121-368 µm wide, contained 10-45 germ balls and cercariae in various developmental stages. The metacercariae recovered from fish experimentally infected with C. complanatum cercariae were morphologically identical to those from naturally infected fish.


Fig. 1
he map showing the surveyed area of Kaum-ji (pond), Uisong-gun. Kyungsangbuk-do, Korea. An asterisk (*) denotes the surveyed area.

Fig. 2
The freshwater snails, Radix auricularia coreana, collected from Kaum-ji.

Fig. 3
A cercaria of Measurements of Clinostomum complanatum from Radix auricularia coreana. A. Brevifurcate cercaria. Bar = 100 µm. B. The cercaria had a pair of eye spots, a translucent dorsal fin (arrows), mouth opening (filled arrow head) beyond the penetrating organ and ventral sucker analogue (blanked arrow head). Bar = 50 µm. C. The penetrating organ was well developed. Bar = 20µm. D. Excretory pores (arrows) on the furcae. Bar = 50µm.

Fig. 4
A redia from infected Radix auricularia coreana. It contained many germ balls and cercariae in various developmental stages. The birth pore (arrow) was observed beyond the mouth. Bar = 200µm.

Fig. 5
A metacercaria of Clinostomum complanatum from experimentally infected Pseudorasbora parva. Bar = 1µm.


Table 1
Measurements of Clinostomum complanatum cercariae (in µm)

Table 2
Measurements of Clinostomum complanatum rediae (in µm)

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