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Scanning electron microscopy of the collar region of Deropristis inflata and Echinostoma revolutum

Published online by Cambridge University Press:  11 April 2024

I. Kanev ,
B.S. Dezfuli ,
M. Nestorov  and
B. Fried
I. Kanev
Affiliation:
Institute of Experimental Pathology and Parasitology, Bulgarian Academy of Science, Bl. 25, Sofia 1113, Bulgaria
B.S. Dezfuli
Affiliation:
Dipartimento di Biologia Evolutiva, Universita di Ferrara Via L. Borsari, 46, 44100 Ferrara, Italy
M. Nestorov
Affiliation:
Institute of Experimental Pathology and Parasitology, Bulgarian Academy of Science, Bl. 25, Sofia 1113, Bulgaria
B. Fried
Affiliation:
Department of Biology, Lafayette College, Easton, PA 18042, USA
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Abstract

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Scanning electron microscopy (SEM) was used to study the collar region of Deropristis inflata (Molin, 1858), an intestinal digenean of fish, and Echinostoma revolutum (Froelich, 1802), an intestinal digenean of birds. The results showed basic differences in the following morphological features. The collar of D. inflata was open ventrally and dorsally whereas that of E. revolutum was closed dorsally and ventrally, forming a kidney-like ring. The collar of D. inflata was located posterior to the oral sucker, some distance behind the anterior end of the body. That of E. revolutum was located terminally around the oral sucker. The collar of D. inflata had numerous collar spines which varied in size, shape and position. That of E. revolutum had 37 collar-spines, mainly homogenous in their general morphology and with a typical arrangement pattern for 37-collar-spined echinostomes. The collar of D. inflata had few tegumentary papillae whereas that of E. revolutum had abundant papillae. A ventral depressed area occurred in D. inflata, between the acetabulum and oral sucker, dividing the collar into two left and right independent parts. The ventral depression in E. revolutum extended from the ventral sucker to the posterior end of the collar, and was not divided. In D. inflata, tegumentary spines were located on the oral sucker, and the collar was posterior to the sucker. In E. revolutum, the oral sucker and the collar lacked tegumentary spines. The region immediately posterior to the collar also lacked spines in E. revolutum. The collar pattern of D. inflata is undoubtedly more primitive than that of E. revolutum.

Type
Research Article
Information
Journal of Helminthology , Volume 73 , Issue 1 , January 1999 , pp. 51 - 57
Copyright
Copyright © Cambridge University Press 1999

Footnotes

*

H. W. Manter Laboratory of Parasitology, W-529 Nebraska Hall, University of Nebraska-Lincoln, Nebraska 68588-0514 USA.

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