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Histological and histochemical studies on the paraoesophageal glands in cercariae and metacercariae of Echinostoma revolutum and E. trivolvis

Published online by Cambridge University Press:  05 June 2009

J.E. Humphries  and
B. Fried
J.E. Humphries
Affiliation:
Department of Biology, Lafayette College, Easton, PA 18042, USA
B. Fried
Affiliation:
Department of Biology, Lafayette College, Easton, PA 18042, USA
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Abstract

Histological and histochemical studies were made on the excysted metacercariae and cercariae of Echinostoma revolutum and E. trivolvis. The paraoesophageal glands of the cercariae of both echinostome species stained positively with the intravital dyes, neutral red and nile blue sulphate. The paraoesophageal glands of excysted metacercariae of E. revolutum did not display positive staining with the intravital dyes. Some excysted metacercariae of E. trivolvis displayed positive staining of the paraoesophageal glands, while others displayed either a negative reaction or reduced staining. The lack of staining with intravital dyes, of paraoesophageal glands of excysted metacercariae of E. revolutum, suggests that the glands play a role in either the final stages of encystment, or in excystation in E. revolutum.

Type
Research Papers
Information
Journal of Helminthology , Volume 70 , Issue 4 , December 1996 , pp. 299 - 301
Copyright
Copyright © Cambridge University Press 1996

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References

Cleveland, G. & Kearn, G.C. (1989) The function of the paraoesophageal glands in an echinostome (digenean) cercaria (?Cercaria spinifera La Valette, 1855). Journal of Helminthology 63, 231–238.CrossRefGoogle Scholar
Dimitrov, V., Kanev, I., Fried, B. & Radev, V. (1995) Argentophilic structures of the miracidium of Echinostoma trivolvis (Cort, 1914) (Trematoda: Echinostomatidae). Journal of Parasitology 81, 306–307.CrossRefGoogle ScholarPubMed
Fried, B. & Butler, M.S. (1978) Infectivity, excystation, and development on the chick chorioallantois of the metacercaria of Echinostoma revolutum (Trematoda). Journal of Parasitology 64, 175–177.CrossRefGoogle ScholarPubMed
Fried, B. & Roth, R.M. (1974) In vitro excystment of the metacercariae of Parorchis acanthus. Journal of Parasitology 60, 465.CrossRefGoogle ScholarPubMed
Fried, B. & King, B.W. (1989) Attraction of Echinostoma revolutum cercariae to Biomphalaria glabrata dialysate. Journal of Parasitology 75, 55–57.CrossRefGoogle Scholar
Humason, G.L. (1979) Animal tissue techniques. 4th edn.661 pp. W.H. Freeman and Company.Google Scholar
Kanev, I. (1994) Life-cycle, delimitation and redescription of Echinostoma revolutum (Froelich, 1802) (Trematoda: Echinostomatidae). Systematic Parasitology 28, 125–144.CrossRefGoogle Scholar
Kanev, I., Fried, B., Dimitrov, V. & Radev, V. (1995) Redescription of Echinostoma trivolvis (Cort, 1914) (Trematoda: Echinostomatidae) with a discussion on its identity. Systematic Parasitology 32, 61–70.CrossRefGoogle Scholar
Kanev, I., Eisenhut, U., Ostrowski de Nunez, M., Manga-Gonzalez, M.Y. & Radev, V. (1993) Penetration and paraoesophageal gland cells in Echinostoma revolutum cercariae from its type locality. Helminthologia 30,131–133.Google Scholar
Lie, K.J. (1966) Studies on Echinostomatidae (Trematoda) in Malaya. XIV. Body gland cells in cercariae of Echinostoma audyi Lie and Umathevy, and E. lindoense Sandground and Bonne. Journal of Parasitology 52, 1049–1051.CrossRefGoogle Scholar
Schmidt, K.A. & Fried, B. (1996) Experimental infection of Helisoma trivolvis (Colorado strain) snails with cercariae of Echinostoma trivolvis. International Journal for Parasitology 26, 287–289.CrossRefGoogle ScholarPubMed
Smyth, J.D. & Halton, D.W. (1983) The physiology of the trematodes. 2nd edn.Cambridge University Press.Google Scholar