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The Occurrence of Thigmotrichous Ciliated Protozoa Inhabiting the Mantle Cavity of Unionid Molluscs of Illinois

Gregory A. Antipa and Eugene B. Small
Transactions of the American Microscopical Society
Vol. 90, No. 4 (Oct., 1971), pp. 463-472
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3225461
Stable URL: http://www.jstor.org/stable/3225461
Page Count: 10
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The Occurrence of Thigmotrichous Ciliated Protozoa Inhabiting the Mantle Cavity of Unionid Molluscs of Illinois
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Abstract

One hundred and fifty-five unionid bivalves from 16 species and 17 localities in Illinois were examined for ciliated protozoa. Although several species were occasionally found, the arhynchodine thigmotrich Conchophthirus curtus was identified in 55% of the mussels examined comprising 81.5% of the unionid species. C. curtus infected mussels in virtually every waterway sampled. Heterocinetopsis unionidarum, a rhynehodine thigmotrich, heavily infected mussels at one locality although it was found nowhere else. The results of our survey are compared with those of others. Host-specificity, host-suitability, and the nature of symbiosis are discussed.

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