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Korean J Parasitol > Volume 20(2):1982 > Article

Original Article
Korean J Parasitol. 1982 Dec;20(2):123-132. Korean.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1982.20.2.123
Copyright © 1982 by The Korean Society for Parasitology
A Study on the fine tegumental structures of the metacercaria and juvenile stages of Clonorchis sinensis
Soon-Hyung Lee,Sung-Tae Hong and Byong-Seol Seo
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
Abstract

This study was carried out to observe the chronological tegumental changes of juvenile C. sinensis using scanning and transmission electron microscopes (SEM and TEM). The subjected worms were the excysted metacercaria, and l day, 1 week, 2 week and 4 week old worms.

By observation with SEM, the tegument of excysted metacercaria showed many transverse wrinkling or shallow rugae, especially remarkable in anterior half of body, i.e., anterior to ventral sucker. Many spines were arrayed on the whole body surface, and double or triple pointed on anterior half and single pointed on posterior half. The observed sensory papillae were composed of 3 types. The ciliated knob-like papillae (type A in Fujino's classification) were abundant on anterior half, especially around oral sucker. A few plate like elevated papillae (type B) were found on middle part and non-ciliated round swellings (type C papillae) were observed around ventral sucker.

The tegumental surface of 1 day old worms showed deeper rugae, and the posterior body end was covered with cobble stone-like processes of distal cytoplasm. The spines protruded further and the spines on posterior half of body changed to scale-like ones.

The tegument of 1 week old worms became velvety and the spines grew further in length, but the density decreased.

The tegumental processes differentiated much finely in the 2 week and 4 week old specimens and the spines or sensory papillae decreased of their relative density.

The basic tegumental structures, such as distal cytoplasm containing various granules, vesicles and spines, basement membrane complex, muscular layers and tegumental cells were also monitored in 1 week old worms by TEM.

Figures


Figs. 1-5
Fig. 1. SEM, ventral view of whole excysted metacercaria (=EMC) of C. sinensis, showing two suckers, transverse wrinklings, sensory papillae and spines, ×790.

Fig. 2. SEM of C. sinensis EMC, posterior rim of oral sucker showing many ciliated sensory papillae (type A,), transverse rugae and spines, ×7,000.

Fig. 3. SEM of C. sinensis EMC, mid-portion between oral and ventral suckers showing numerous triple pointed spines, ×7,100.

Fig. 4. SEM of C. sinensis EMC, ventral surface of posterior body with numerous single pointed spines, and no tegumental rugae, ×7,100.

Fig. 5. SEM of C. sinensis EMC, oral sucker with many small or large sensory papillae, ×2,800.



Figs. 6-11
Fig. 6. SEM of C. sinensis EMC, ventral sucker with several sensory papillae of type A and C (round swelling of sucker margin), ×2,530.

Fig. 7. SEM of 1 day old C. sinensis, dorsal surface showing more wrinkled tegument, double or triple pointed spines and cilliated sensory papillae, ×7,100.

Fig. 8. SEM of 1 day old C. sinensis, dorsal surface of posterior body covered by cobblestone-like tegumental processes, ×7,100.

Fig. 9. SEM of 1 day old C. sinensis, mid-dorsal surface with transverse rugae and spines, ×7,100.

Fig. 10. SEM of 1 day old C. sinensis, surface of posterior body with scale-like spines, ×7,100.

Fig. 11. SEM of 1 day old C. sinensis, oral sucker with many ciliated sensory papillae and the spines, ×5,100.



Figs. 12-16
Fig. 12. SEM of 1 week old C. sinensis, ventral surface posterior to oral sucker, showing paired ciliated sensory papillae, velvety tegumental processes and 3~4 pointed spines, ×7,100.

Fig. 13. SEM of 1 week old C. sinensis, velvety surface of posterior body with slender leaf-like spines, ×7,100.

Fig. 14. SEM of 1 week old C. sinensis, fine velvety bodysurface at the posterior end, ×7,100.

Fig. 15 & 16. TEM of 1 week old C. sinensis, showing the processes of tegumental syncytial layer, basement membrane, muscle layer and tegumental cell layer. A spine is sectioned in tegumental layer and numerous electron-dense granules are found, ×3,000.



Figs. 17-19
Fig. 17. SEM of 2 week old C. sinensis, posterior to oral sucker, showing fine velvety tegumental processes with round tips and triple pointed spines, ×7,000.

Fig. 18. TEM of 2 week old C. sinensis, showing more differentiated tegumental syncytium, ×2,000.

Fig. 19. TEM of 2 week old C. sinensis, tegumental syncytium with many electron-dense granules and vacuoles, ×12,000.


Tables


Table 1
Summary of SEM findings of C. sinensis tegument by the age of worms

References
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