The cercaria morphology of Echinochasmus japonicus was investigated using light and scanning electron microscopy. Cercariae, liberated from naturally infected snails (Parafossarulus manchouricus), had ovoid bodies and diminutive tails. The cercaria tegument was covered with minute spines. Four type II sensory papillae were observed on the dorsal side of the oral sucker, and type I papillae were distributed on the dorsal tegument surfaces. When cercariae were kept in the same bath as the freshwater fish, Pseudorasbora parva, which were free from trematode infections, parasites encysted only in the gills of fishes at day 4 postinfection (PI). The outermost metacercaria wall was fully formed in host tissues at day 7 PI. Adult worms were recovered from the intestines of rats, chicks, and ducks 28 days after experimental exposure to metacercariae. The head crown of the adult was armed with 24 collar spines, which were interrupted dorsal to the oral sucker, and the species was identified as E. japonicus.
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April 2006
Research Article|
April 01 2006
MORPHOLOGICAL OBSERVATIONS OF ECHINOCHASMUS JAPONICUS CERCARIAE AND THE IN VITRO MAINTENANCE OF ITS LIFE CYCLE FROM CERCARIAE TO ADULTS
Min-Ho Choi;
Min-Ho Choi
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Sae Hoon Kim;
Sae Hoon Kim
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Jong-Hoon Chung;
Jong-Hoon Chung
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Hye-Jin Jang;
Hye-Jin Jang
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Joon-Ho Eom;
Joon-Ho Eom
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Byung-Suk Chung;
Byung-Suk Chung
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Woon-Mok Sohn;
Woon-Mok Sohn
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
* Department of Parasitology and Institute of Health Sciences, Gyeongsang National University College of Medicine, Chinju 660-751, Korea
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Jong-Yil Chai;
Jong-Yil Chai
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
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Sung-Tae Hong
Sung-Tae Hong
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea. hst@snu.ac.kr
† To whom correspondence should be addressed
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J Parasitol (2006) 92 (2): 236–241.
Citation
Min-Ho Choi, Sae Hoon Kim, Jong-Hoon Chung, Hye-Jin Jang, Joon-Ho Eom, Byung-Suk Chung, Woon-Mok Sohn, Jong-Yil Chai, Sung-Tae Hong; MORPHOLOGICAL OBSERVATIONS OF ECHINOCHASMUS JAPONICUS CERCARIAE AND THE IN VITRO MAINTENANCE OF ITS LIFE CYCLE FROM CERCARIAE TO ADULTS. J Parasitol 1 April 2006; 92 (2): 236–241. doi: https://doi.org/10.1645/GE-354R1.1
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