| Home | E-Submission | Sitemap | Contact us |  
top_img
Korean J Parasitol > Volume 36(2):1998 > Article

Original Article
Korean J Parasitol. 1998 Jun;36(2):91-98. English.
Published online Jun 20, 1998.  http://dx.doi.org/10.3347/kjp.1998.36.2.91
Copyright © 1998 by The Korean Society for Parasitology
Life history of Echinoparyphium recurvatum (Trematoda: Echinostomatidae) in Korea
W M Sohn
Department of Parasitology, College of Medicine, Gyeongsang National University, Chinju 660-280, Korea.
Received February 24, 1998; Accepted April 13, 1998.

Abstract

The present study was performed to observe characteristics of the life history of Echinoparyphium recurvatum under both natural and laboratory conditions in Korea. A batch of Radix auricularia coreana was collected from Sunamchon, one of the stream of West Naktonggang (River), in Kangso-gu, Pusan during August and September 1992. Out of 106 snails examined by crushing, 52 (49.0%) were infected with larval E. recurvatum, i.e. rediae, cercariae and metacercariae. Cercariae naturally shed from snails encysted in the snails of same species and loaches, but not in mud-snails. Adult worms were detected from chicks and ducks experimentally infected with metacercariae, but not from rats and mice. The average recovery rate of adults from chicks was 13.1%. Rediae were sac-like, 2.437 × 0.317 mm in average size, with a muscular pharynx and a brownish cecum which reached the anterior half of the body. Cercariae consisted of a spindle-shaped body (0.262 × 0.129 mm in average) and a rod-like tail (0.528 × 0.056 mm in average). In the cercarial body, 45 collar spines were observed on the head crown, and double rows of excretory ducts with fine granules were laterally arranged between the pharynx and the ventral sucker. Metacercariae were spherical, 0.144 × 0.142 mm in average size, with thick hyaline outer and thin elastic inner walls, and many excretory granules. Adults were slender and more attenuated in the anterior end, 2.760 × 0.550 mm in average size, and had 45 collar spines including four end group spines on both ventral corners. From the above results, it was confirmed that R. auricularia coreana plays a pivotal role in the life cycle of E. recurvatum as the first and/or second intermediate hosts in Korea.

Figures


Figs. 1-4
Schematic drawings of the larvae and adult of Echinoparyphium recurvatum from naturally infected snails, Radix auricularia coreana, and an experimentally infected chick. Fig. 1. A daughter redia has a muscular pharynx, a brownish cecum reaching the anterior half of the body, and several mature cercariae. Fig. 2. A cercaria consists of a spidle-shaped body and a rod-like tail. Fig. 3. A metacercaria has a thick hyaline and thin elastic walls, a characteristic head crown with 45 collar spines, and many excretory granules. Fig. 4. A adult worm is slender and more attenuated in the anterior end. It also has a well developed head crown with 45 collar spines including four end group spines on both ventral corners.


Figs. 5-6
SEM views of collar spines on the head crown of an adult E. recurvatum. Fig. 5. Ventral view showing the four end group spines (boxed) and three lateral spines (arrow heads). Fig. 6. Dorsal view showing the alternately arranged collar spines.

Tables


Table 1
Infection status with larval Echinoparyphium recurvatum in Radix auricularia coreanaa) from the Sunamchon (Stream) in Kangso-gu, Pusan


Table 2
Measurementsa) of E. recurvatum cercariae from R. auricularia coreana


Table 3
Recovery of E. recurvatum from the experimentally infected chicks


Table 4
Measurementsa) of E. recurvatum adults and comparison with those of previous authors

References
1. Azim MA. On the identification and life history of Echinostomum recurvatum von Linstow, 1873. Ann Trop Med Parasit 1930;24:189–192.
3. Buscher HN. Echinoparyphium speotyto sp. n. (Trematoda: echinostomatidae) from the burrowing owl in Oklahoma, with a discussion of the genus Echinoparyphium. J Parasitol 1978;64(1):52–58.
  
4. Chu JK, Cho YJ, Chung SB, Won BO, Yoon MB. [Study on the trematode parasites of the birds in Korea]. Korean J Parasitol 1973;11(2):70–75.
 
6. Grabda-Kazubska B. Gatunki blizniacze wrodzaju Echinoparyphium Dietz, 1909 (Digenea, Echinostomatidae). Cited from kiseliene and Grabda-Kazubska (1990). Acta Parasitol Polon 1984;35:285–295.
7. Grabda-Kazubska B, et al. Chaetotaxy and excretory system of the cercaria of Echinoparyphium recurvatum (Linstow, 1873) (Digenea, Echinostomatidae). Acta parasitol Polon 1989;34:325–335.
8. Grabda-Kazubska B, et al. The life cycle of Echinoparyphium mordwilkoi Skrjabin, 1915 (Trematoda, Echinostomatidae). Acta Parasitol Polon 1991;36:167–173.
9. Harper WF. On the structure and lifehistory of British freshwater larval trematodes. Parasitology 1929;21:189–219.
 
10. Kiseliene V, et al. Echinoparyphium pseudorecurvatum sp. n. (Trematoda, Echinostomatidae) and its life cycle. Acta Parasitol Polon 1990;35:285–295.
11. Lee SH, Sohn WM, Chai JY. Echinostoma revolutum and Echinoparyphium recurvatum recovered from house rats in Yangyang-gun, Kangwon-do. Korean J Parasitol 1990;28(4):235–240.
 
12. Mathias P. Sur le cycle evolutif d'un trematode de la famille des Echinostomidae Dietz (Echinoparyphium recurvatum Linstow). C R Acad Sci 1926;183:90–92.
13. Mathias P. Cycle evolutif d'un trematode de la famile des Echinostomidae (Echinoparyphium recurvatum Linstow). Ann Sci Nat 1927;10:289–310.
14. McCarthy AM. Speciation of echinostomes: evidence for the existence of two sympatric sibling species in the complex Echinoparyphium recurvatum (von Linstow 1873) (Digenea: Echinostomatidae). Parasitology 1990;101(Pt 1):35–42.
  
15. Moravec F, Barus V, Rysavy B, Yousif F. Observations on the development of two echinostomes, Echinoparyphium recurvatum and Echinostoma revolutum, the antagonists of human schistosomes in Egypt. Folia Parasitol (Praha) 1974;21(2):107–126.
16. Nevostrueva LS. Studies on the life cycle of Echinoparyphium recurvatum (Linstow, 1873). Cited from Grabda-Kazubska and Kiseliene (1989). Acta Parasitol Polon 1964;34:325–335.
17. Odening K. Bemerkungen zum Exkretions-system dreier echinostomer Cercarien sowiezur Identitat der Gattungen Neoacanthoparyphium Yamaguti and Allopetasiger Yamaguti (Trematoda: Echinostomatidae). Z Parasitenkd 1962;21:521–534.
 
21. Tsuchimochi KI. On the life cycle of two species of echinostomatid trematodes I Studies on trematodes of domestic fowls in Formosa. Dobutsugaku Zasshi 1924;36:245–258.
22. Yamaguti S. Studies on the helminth fauna of Japan. Part 1. Jpn J Zool 1933;5:1–134.
24. Yamashita J. Echinostome. Prog Med Parasit in Japan 1964;1:288–313.
Editorial Office
Department of Molecular Parasitology, Samsung Medical Center, School of Medicine, Sungkyunkwan University,
2066 Seobu-ro, Jangan-gu, Suwon 16419, Gyeonggi-do, Korea.
Tel: +82-31-299-6251   FAX: +82-1-299-6269   E-mail: kjp.editor@gmail.com
About |  Browse Articles |  Current Issue |  For Authors and Reviewers
Copyright © 2022 by The Korean Society for Parasitology and Tropical Medicine.     Developed in M2PI