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On Crepidostomum farionis O. F. Müll. (= Stephanophiala laureata Zeder), a Distome Parasite of the Trout and Grayling. I. The Life History

Published online by Cambridge University Press:  06 April 2009

F. J. Brown
F. J. Brown
Affiliation:
Assistant Lecturer in Zoology, Leeds University.
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Extract

1. Crepidostomum farionis inhabits the gall bladder, as well as the intestine and pyloric caeca, of the trout and grayling.

2. The life history of Crepidostomum farionis has been worked out and is based on the similarity of organisation of the cercaria, encysted larval trematode and the adult.

3. The first intermediate hosts in the life history of this trematode are Pisidium amnicum (Müll.) and Sphaerium corneum (L.) though the latter is unusual.

4. The second intermediate host is the larva of the mayfly, Ephemera danica (Müll.).

5. There are two generations of rediae, the first gives rise to daughter rediae, which in turn produce cercariae.

6. The rediae are characterised by the absence of ambulatory processes and a functional intestine.

7. The cercaria (n.sp.) possesses “eye spots,” stylet and gland cells (salivary?), and the excretory vesicle is tube-shaped.

8. The excretory system of the redia and the cercaria has been worked out in detail.

9. The relation of the parasites to their respective hosts is discussed. On account of the need for further observations definite conclusions are held over for a later paper.

Type
Research Article
Information
Parasitology , Volume 19 , Issue 1 , March 1927 , pp. 86 - 99
Copyright
Copyright © Cambridge University Press 1927

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