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Studies on the Family Opisthorchiidaæ Braun, 1901, with a description of a New Species of Opisthorchis from a Sarus Crane (Antigone antigone)

Published online by Cambridge University Press:  05 June 2009

D. O. Morgan
D. O. Morgan
Affiliation:
Research Assistant in the Institute of Agricultural Parasitology, London School of Hygiene and Tropical Medicine
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Extract

The classification of the Trematode family Opisthorchiidæ presents some difficulties to the systematist. These difficulties arise partly from the fact that a number of the existing species appear to lack any real morphological characters by which they can be differentiated, slight variations in measurements, together with a difference in host, having been considered sufficient to justify the making of new species. This view has resulted in the placing of undue importance on somewhat minor differences when they do occur in other species, such differences being considered sufficient for creating new genera.

The systematist is further confronted with the difficulty of forming definite opinions on the systematic position of some of the species made by earlier workers. Their descriptions and figures are often inadequate owing to the fact that characters which, in the past, were considered of minor importance are now given much closer attention. Examples of the confusion which has arisen from such a position will be referred to in this paper.

Type
Research Article
Information
Journal of Helminthology , Volume 5 , Issue 2 , June 1927 , pp. 89 - 104
Copyright
Copyright © Cambridge University Press 1927

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