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Identification of Stictodora lari (Heterophyidae) metacercariae encysted in the brackish water fish, Acanthogobius flavimanus
J Y Chai,S K Park,S J Hong,*M H Choi and S H Lee
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Seoul 110-460, Korea.
Department of Parasitology, College of Medicine, Gyeong-Sang National University, Chinju 660-280, Korea.
Abstract
Metacercariae of the genus Stictodora encysted in the head tissue of Acanthogobius flavimanus (the gobies) caught at Sachun-gun, Kyongnam Province, were identified to be Stictodora lari Yamaguti, 1939 (Trematoda: Heterophyidae), a new parasite fauna in Korea. The metacercariae were 0.39-0.43 mm by 0.32-0.35 mm in size, long elliptical, and with a thin and transparent cyst wall. Total 200 metacercariae were collected from 50 gobies. In order to obtain adult worms two kittens and a puppy were infected each with 34-100 metacercariae, and total 33 adults were recovered between the day 4 and day 8 post-infection. The S. lari adults measured 0.95-1.18 mm long and 0.26-0.32 mm wide and the eggs in uteri 0.028-0.033 mm by 0.017-0.020 mm. The most characteristic morphological feature of these flukes was the presence of a gonotyl and gonotyl spines arranged in two groups; densely crowded group of 30-40 spines and linearly-arranged one of 30-40 spines, together of which made a comma (or reversed comma) shape along the lateral margin of the gonotyl. It has been proved by this study that S. lari is distributed in southern coasts of Korea.
Figures
Fig. 1 Magnification of the metacercaria showing the ventrogenital sac(arrows), in which the gonotyl spines are not apparent.
Fig. 2 Magnification of the metacercaria showing the ventrogenital sac(arrows), in which the gonotyl spines are not apparent.
Fig. 3 An adult worm of S. lari recovered from a puppy 8 days after experimental infection.
Fig. 4 Mid-portion of an adult S. lari showing the ventrogenital sac, seminal vesicle(arrow heads), ovary(OV), testes(T) and eggs in the uterus.
Fig. 5 Magnification of the gonotyl and gonotyl spines. Note reversed comma-shape of the gonotyl spines.
Fig. 6 The uterine eggs of S. lari, that are long and ovoid with a thick shell.
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