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Fasciola gigantica: surface topography of the adult tegument

Published online by Cambridge University Press:  12 April 2024

T. Dangprasert ,
W. Khawsuk ,
A. Meepool ,
C. Wanichanon ,
V. Viyanant ,
E.S. Upatham ,
S. Wongratanacheevin  and
P. Sobhon
T. Dangprasert
Affiliation:
Department of Anatomy and Mahidol University, Rama VI Road, Bangkok 10400, Thailand
W. Khawsuk
Affiliation:
Department of Anatomy and Mahidol University, Rama VI Road, Bangkok 10400, Thailand
A. Meepool
Affiliation:
Department of Anatomy and Mahidol University, Rama VI Road, Bangkok 10400, Thailand
C. Wanichanon
Affiliation:
Department of Anatomy and Mahidol University, Rama VI Road, Bangkok 10400, Thailand
V. Viyanant
Affiliation:
Department of Biology, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand
E.S. Upatham
Affiliation:
Department of Biology, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand
S. Wongratanacheevin
Affiliation:
Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
P. Sobhon*
Affiliation:
Department of Anatomy and Mahidol University, Rama VI Road, Bangkok 10400, Thailand
*
*Author for correspondence, Fax: 662 2479880, E-mail: scpso@ mahidol.ac.th
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Abstract

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Adult Fasciola gigantica are leaf-shaped with tapered anterior and posterior ends and measure about 35 mm in length and 15 mm in width across the mid section. Under the scanning electron microscope its surface appears rough due to the presence of numerous spines and surface foldings. Both oral and ventral suckers have thick rims covered with transverse folds and appear spineless. On the anterior part of the ventral surface of the body, the spines are small and closely-spaced. Each spine has a serrated edge with 16 to 20 sharp points, and measures about 20 μm in width and 30 μm in height. In the mid-region the spines increase in size (up to 54 μm in width and 58 μm in height) and number, especially towards the lateral aspect of the body. Towards the posterior end the spines progressively decrease in both size and number. The tegumental surface between the spines appears highly corrugated with transverse folds alternating with grooves. At higher magnifications the surface of each fold is further increased with a meshwork of small ridges separated by variable-sized pits or slits. There are three types of sensory papillae on the surface. Types 1 and 2 are bulbous, measuring 4–6 μm in diameter at the base with nipple-like tips, and the type 2 also have short cilia. Type 3 papillae are also bulbous and of similar size but with a smooth surface. These sensory papillae usually occur in clusters, each having between 2 and 15 units depending on the region of the body. Clusters of papillae on the lateral aspect (usually types 1 and 2) and around the suckers (type 3) tend to be more numerous and larger in size. The dorsal side of the body exhibits similar surface features, but the spines and papillae appear less numerous and are smaller. Corrugation and invaginations of the surface are also less extensive than on the ventral side of the body.

Type
Research Article
Information
Journal of Helminthology , Volume 75 , Issue 1 , January 2001 , pp. 43 - 50
Copyright
Copyright © Cambridge University Press 2001

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