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Korean J Parasitol > Volume 31(1):1993 > Article

Original Article
Korean J Parasitol. 1993 Mar;31(1):7-12. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1993.31.1.7
Copyright © 1993 by The Korean Society for Parasitology
Parvatrema timondavidi (Digenea; Gymnophallidae) transmitted by a clam, Tapes philippinarum, in Korea
Jae-Ran Yu,*1Jong-Yil Chai,2 and Soon-Hyung Lee2
1Department of Parasitology, College of Medicine, Kon-Kuk University, Chungju 380-701, Korea.
2Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
Received December 31, 1992; Accepted January 28, 1993.

Abstract

Metacercariae of Parvatrema timondavidi (Digenea; Gymnophallidae) were found from Tapes philippinarum, one of the most common marine clams in Korea. T. philippinarum was collected from a fishery market in Seoul, and all of the clams examined were found to contain many gymnophallid metacercariae. To get adult worms, 10 ICR mice were fed with 100 metacercariae each and sacrificed by cervical dislocation at 7, 10 and 14 days after the infection. The adult worms harvested from the intestinal contents of the mice were morphologically characterized by oval body shape, large oral sucker with lateral projections on the lip, absence of the ventral pit, single cluster of vitellaria, and separately located genital pore from the ventral sucker. Based on these characters they identified as P. timondavidi Bartoli, 1964. This study first confirms the presence of P. timondavidi metacercariae in T. philippinarum in Korea.

Figures


Figs. 1-5
Fig. 1.Tapes philippinarum purchased at a fishery market in Seoul. Fig. 2. Unencysted metacercariae parasitized on the surface of the mantle in T. philippinarum. Fig. 3. A metacercaria of the P. timondavidi. c: ceca, eb: excretory bladder, os: oral sucker, ov: ovary, p: pharynx, t: testis, vs: ventral sucker. Bar: 50 µm. Fig. 4. Coronal section of a metacercaria. The cecum wall was lined with one layer of large columnar cells. cw: ceca wall. Bar: 50 µm. Fig. 5. A metacercaria showing a small round genital pore (gp). Bar: 50 µm.


Figs. 6-9
Fig. 6. Sagittal section of a metacercaria showing the tube like genital atrium. c: ceca, ga: genital atrium, os: oral sucker, p: pharynx, t: testis, vs: ventral sucker. Bar: 50 µm. Fig. 7. A ten-day-old worm from experimentally infected mouse showing prominent lateral projections on the oral sucker. L: lateral projection, sv: seminal vesicle. Bar: 50 µm. Fig. 8. The lateral projections on the lip of the oral sucker. Fig. 9. Elliptical and operculated intrauterine eggs with very thin egg shell. Bar: 25 µm.


Fig. 10
Drawing of 10-day-old P. timondavidi. c: ceca, eb: excretory bladder, gp: genital pore, os: oral sucker, ov: ovary, p: pharynx, sv: seminal vesicle, t: testis, vs: ventral sucker, vt: vitelline gland.

Tables


Table 1
Recovery rates of Parvatrema timondavidi from mice infected with metacercariae


Table 2
Comparison of the measurements P. timondavidi with Endo's redescription of G. bursicola (Ogata, 1994)(unit:µm)

References
1. Ching HL. Description of Gymnophallus somateriae (Levinsen, 1881) from Macoma inconspicua and diving ducks from Vancouver, Canada. Can J Zool 1973;51(8):801–806.
  
3. James BL. Parasitology 1964;54:1–41.
 
6. Ogata T. Science Report of Tokyo Bunrika Daigaku 1944;7(102):1–24.
8. Shimazu T. Jpn J Parasit 1975;24(5):300–311.
9. Yamaguti S. Jpn J Zool 1939;8:129–210.
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