Acanthobothrium quadripartitumsp.nov. (Cestoda: Tetraphyllidea) fromRaja naevusin the North Sea and English Channel

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Abstract
Acanthobothrium quadripartitumsp.nov., from the intestine ofRaja naevusin the North Sea and English Channel is described and figured. In adult morphology it resemblesA. brevissimeLinton, 1908, more closely than any other known species of the genus.A. quadripartitumis one of the smallest known tapeworms and occurs in numbers of up to 13000 in one intestine. Preliminary observations indicate that it has little damaging effect on the epithelial cells of the host's mucosa.I am indebted to Professor V. C. Wynne-Edwards for providing excellent research facilities and to the Director and Staff, in particular Dr B. B. Rae, Dr Z. Kabata and Mr Stuart Pirie, Marine Laboratory, Aberdeen, for laboratory space and material.